Exhibit 10.1


 


August 2, 2019


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


 


Chardan Capital Markets,
LLC


17 State Street, Suite 1600


New York, NY 10004


 


		Re:	Initial Public Offering



 


Ladies and Gentlemen:


 


This letter is
being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered
into by and between Orisun Acquisition Corp., a Delaware corporation (the “Company”), and Chardan Capital
Markets, LLC, as Representative (the “Representative”) of the several underwriters named on Schedule
A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”)
of the Company’s units (the “Units”), each comprised of one share of common stock of the Company,
par value $0.00001 per share (the “Common Stock”), one redeemable warrant, each warrant entitling its
holder to purchase one-half (1/2) of a share of Common Stock at an exercise price of $11.50 per full share (the “Warrants”),
and one right to receive one-tenth (1/10) of a share of Common Stock (the “Rights”). Certain capitalized
terms used herein are defined in paragraph 14 hereof.


 


In order to induce the
Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit
that such IPO will confer upon the undersigned, and for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby agrees with the Company as follows:


 


1. If the Company solicits
approval of its stockholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned
by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.


 


2. (a) Unless the Company’s
stockholders are previously given the option to redeem their shares in connection with amending applicable documents to extend
the time that the Company has to complete a Business Combination and that the Company fails to consummate a Business Combination
within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to
consummate a business combination up to three times, each by an additional three months, within 21 months) from the closing of
the Company’s IPO, the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed
to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.


 



     


     


    

 


(b) The undersigned
hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining
net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares including any shares underlying
the Private Units (“Claim”) and hereby waives any Claim the undersigned may have in the future as a result
of, or arising out of, any contracts or agreements with the Company and will not seek recourse against the Trust Fund for any reason
whatsoever. The undersigned acknowledges and agrees that there will be no distribution from the Trust Fund with respect to any
Warrants or Rights and with respect to all securities underlying the Private Units, all of which will terminate on the Company’s
liquidation.


 


[(c) Intentionally
Omitted.]


 


[(d) Intentionally
Omitted.]


 


3. [Intentionally Omitted.]


 


4. The undersigned will
escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into
with the undersigned and an escrow agent acceptable to the Company.


 


5. The undersigned agrees
that until the Company consummates a Business Combination, the undersigned’s Private Units will be subject to the transfer
restrictions described in the Subscription Agreement relating to the undersigned’s Private Units.


 


6. In order to minimize
potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for
its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business,
until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any
pre-existing fiduciary and contractual obligations the undersigned might have.


 


7. (a) The undersigned
acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders
of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has
received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be
approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an
independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated stockholders from
a financial point of view.


 


(b) The undersigned
hereby agrees and acknowledges that (i) each of the Underwriters and the Company may be irreparably injured in the event of a breach
of any of the obligations contained in this letter, (ii) monetary damages may not be an adequate remedy for such breach and (iii)
the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law
or in equity, in the event of such breach.


 



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8. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept
any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business
Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company
in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the
undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying,
investigating and consummating a Business Combination.


 


9. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s
fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the
undersigned originates a Business Combination.


 


10. The undersigned’s
FINRA Questionnaire previously furnished to the Company and the Representative is true and accurate in all material respects. The
undersigned represents and warrants that:


 


		(a)	He, she or it has never had a petition under the federal bankruptcy laws or any state insolvency law been filed by or against
(i) him, her or it, or any partnership in which he or she was a general partner at or within two years before the time of filing;
or (ii) any corporation or business association of which he or she was an executive officer at or within two years before the time
of such filing;



 


		(b)	He, she or it has never had a receiver, fiscal agent or similar officer been appointed by a court for his business or property,
or any such partnership;



 


		(c)	He, she or it has never been convicted of fraud in a civil or criminal proceeding;



 


		(d)	He, she or it has never been convicted in a criminal proceeding or named the subject of a pending criminal proceeding (excluding
traffic violations and minor offenses);



 


		(e)	He, she or it has never been the subject of any order, judgment or decree, not subsequently reversed, suspended or vacated,
of any court of competent jurisdiction, permanently or temporarily enjoining or otherwise limiting him, her or it from (i) acting
as a futures commission merchant, introducing broker, commodity trading advisor, commodity pool operator, floor broker, leverage
transaction merchant, any other person regulated by the Commodity Futures Trading Commission (“CFTC”) or an associated
person of any of the foregoing, or as an investment adviser, underwriter, broker or dealer in securities, or as an affiliated person,
director or employee of any investment company, bank, savings and loan association or insurance company, or from engaging in or
continuing any conduct or practice in connection with any such activity; or (ii) engaging in any type of business practice;
or (iii) engaging in any activity in connection with the purchase or sale of any security or commodity or in connection with
any violation of federal or state securities or federal commodities laws;



 



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		(f)	He, she, or it has never been the subject of any order, judgment or decree, not subsequently reversed, suspended or vacated,
of any federal or state authority barring, suspending or otherwise limiting for more than 60 days his, her or its right to engage
in any activity described in 10(e)(i) above, or to be associated with persons engaged in any such activity;



 


		(g)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by the SEC to have violated any
federal or state securities law, where the judgment in such civil action or finding by the SEC has not been subsequently reversed,
suspended or vacated;



 


		(h)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by the CFTC to have violated
any federal commodities law, where the judgment in such civil action or finding by the CFTC has not been subsequently reversed,
suspended or vacated;



 


		(i)	He, she, or it has never been the subject of, or a party to, any Federal, State or foreign judicial or administrative order,
judgment, decree or finding, not subsequently reversed, suspended or vacated, relating to an alleged violation of (i) any Federal,
State or foreign securities or commodities law or regulation, (ii) any law or regulation respecting financial institutions or insurance
companies including, but not limited to, a temporary or permanent injunction, order of disgorgement or restitution, civil money
penalty or temporary or permanent cease-and desist order, or removal or prohibition order or (iii) any law or regulation prohibiting
mail or wire fraud or fraud in connection with any business entity;



 


		(j)	He, she or it has never been the subject of, or party to, any sanction or order, not subsequently reversed, suspended or vacated,
or any self-regulatory organization, any registered entity, or any equivalent exchange, association, entity or organization that
has disciplinary authority over its members or persons associated with a member;



 


		(k)	He, she or it has never been convicted of any felony or misdemeanor: (i) in connection with the purchase or sale of any security;
(ii) involving the making of any false filing with the SEC; or (iii) arising out of the conduct of the business of an underwriter,
broker, dealer, municipal securities dealer, investment advisor or paid solicitor of purchasers of securities;



 



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		(l)	He, she or it was never subject to a final order of a state or foreign securities commission (or an agency of officer of a
state performing like functions); a state or foreign authority that supervises or examines banks, savings associations, or credit
unions; a state or foreign insurance commission (or an agency or officer of a state performing like functions); an appropriate
federal or foreign banking agency; the CFTC; or the National Credit Union Administration that is based on a violation of any law
or regulation that prohibits fraudulent, manipulative, or deceptive conduct;



 


		(m)	He, she or it has never been subject to any order, judgment or decree of any court of competent jurisdiction, that, at the
time of the sale of the Units, restrained or enjoined him, her or it from engaging or continuing to engage in any conduct or practice:
(i) in connection with the purchase or sale of any security; (ii) involving the making of any false filing with the SEC or any
foreign regulatory agency with similar functions; or (iii) arising out of the conduct of the business of an underwriter, broker,
dealer, municipal securities dealer, investment adviser or paid solicitor of purchasers of securities;



 


		(n)	He, she or it has never been subject to any order of the SEC or any foreign regulatory agency with similar functions that orders
him, her or it to cease and desist from committing or causing a future violation of: (i) any scienter-based anti-fraud provision
of the federal securities laws, including, but not limited to, Section 17(a)(1) of the Securities Act, Section 10(b) of the Exchange
Act and Rule 10b-5 thereunder, Section 15(c) and Section 206(1) of the Advisers Act or any other rule or regulation thereunder;
or (ii) Section 5 of the Securities Act;



 


		(o)	He, she or it has never filed (as a registrant or issuer), or been named as an underwriter in any registration statement or
Regulation A offering statement filed with the SEC that was the subject of a refusal order, stop order, or order suspending the
Regulation A exemption, or is, currently, the subject of an investigation or proceeding to determine whether a stop order or suspension
order should be issued;



 


		(p)	He, she or it has never been subject to a United States Postal Service false representation order, or is currently subject
to a temporary restraining order or preliminary injunction with respect to conduct alleged by the United States Postal Service
to constitute a scheme or device for obtaining money or property through the mail by means of false representations;



 


		(q)	He, she or it is not subject to a final order of a state securities commission (or an agency of officer of a state performing
like functions); a state authority that supervises or examines banks, savings associations, or credit unions; a state insurance
commission (or an agency or officer of a state performing like functions); an appropriate federal banking agency; the CFTC; or
the National Credit Union Administration that bars the undersigned from: (i) association with an entity regulated by such commission,
authority, agency or officer; (ii) engaging in the business of securities, insurance or banking; or (iii) engaging in savings association
or credit union activities;



 



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		(r)	He, she or it is not subject to an order of the SEC entered pursuant to section 15(b) or 15B(c) of the Securities Exchange
Act of 1934 (the “Exchange Act”) or section 203(e) or 203(f) of the Investment Advisers Act of 1940 (the “Advisers
Act”) that: (i) suspends or revokes the undersigned’s registration as a broker, dealer, municipal securities dealer
or investment adviser; (ii) places limitations on the activities, functions or operations of, or imposes civil money penalties
on, such person; or (iii) bars the undersigned from being associated with any entity or from participating in the offering of any
penny stock; and



 


		(s)	He, she or it has never been suspended or expelled from membership in, or suspended or barred from association with a member
of, a securities self-regulatory organization (e.g., a registered national securities exchange or a registered national or affiliated
securities association) for any act or omission to act constituting conduct inconsistent with just and equitable principles of
trade.



 


11. [Intentionally Omitted.]


 


12. The undersigned hereby
waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the
undersigned, directly or indirectly (or to sell such shares to the Company in a tender offer), whether purchased by the undersigned
prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise
sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions
of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business
Combination.


 


13. The undersigned hereby
agrees to not propose, or vote in favor of, an amendment to the Company’s Amended and Restated Certificate of Incorporation
with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless
the Company offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.


 


14. In connection with
Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the
application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising
out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with
the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought
before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English
and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s
decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost
of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne
by the non-prevailing party or as otherwise directed by the arbitrators.


 



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15. As used herein, (i)
a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement,
share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities;
(ii) “Insiders” shall mean all officers, directors and stockholders of the Company immediately prior
to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired
by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares”
shall mean the shares of Common Stock issued in the Company’s IPO; (v) “Private Units” shall mean
(x) the Units purchased in the private placement taking place simultaneously with the consummation of the Company’s IPO and
(y) the additional Units that may be purchased in connection with the exercise of the over-allotment option by the underwriters
in the IPO as described in the Registration Statement; (vi) “Registration Statement” means the registration
statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust Fund” shall mean
the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.


 


16. Any notice, consent
or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall
be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile
transmission.


 


If to the Representative:


 


Chardan Capital Markets, LLC


17 State Street, Suite 1600


New York, NY 10004


Attn: George Kaufman


Facsimile: (646) 465-9039


 


with a copy (which copy shall not constitute
notice) to:


 


Ellenoff Grossman & Schole LLP 


1345 Avenue of the Americas


New York, New York 10105


Attn: Stuart Neuhauser, Esq. and Ari Edelman, Esq.


Facsimile.: (212) 370-7889


 


If to the Company:


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


Attn: Wei Chen, Chief Executive Officer


 



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with a copy (which copy shall not constitute
notice) to:


 


Loeb & Loeb LLP


345 Park Avenue


New York, NY 10154


Attn: Giovanni Caruso, Esq.


Facsimile: (212) 504-3013


 


17. No party hereto may
assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent
of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate
to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto
and any successors and assigns thereof.


 


18. This Letter Agreement
constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate
in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may not be changed, amended,
modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument
executed by all parties hereto.


 


19. The undersigned acknowledges
and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein
in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters a representative of, or a fiduciary
with respect to, the Company, its stockholders or any creditor or vendor of the Company with respect to the subject matter hereof.


 



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	 	Everstone Investments LLC
	 	 	 
	 	By:	/s/
    Wei Chen
	 	Name:  	Wei Chen
	 	Title: 	Managing Member


 


 


 


 


 


Signature Page to Insider Letter


 



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August
2, 2019


 


Orisun
Acquisition Corp.


555
Madison Avenue, Room 543


New
York, NY 10022


 


Chardan
Capital Markets, LLC


17
State Street, Suite 1600


New
York, NY 10004


 


		Re:	Initial
                                         Public Offering



 


Ladies
and Gentlemen:


 


This
letter is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”)
entered into by and between Orisun Acquisition Corp., a Delaware corporation (the “Company”), and Chardan
Capital Markets, LLC, as Representative (the “Representative”) of the several underwriters named on
Schedule A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”)
of the Company’s units (the “Units”), each comprised of one share of common stock of the Company,
par value $0.00001 per share (the “Common Stock”), one redeemable warrant, each warrant entitling its
holder to purchase one-half (1/2) of a share of Common Stock at an exercise price of $11.50 per full share (the “Warrants”),
and one right to receive one-tenth (1/10) of a share of Common Stock (the “Rights”). Certain capitalized
terms used herein are defined in paragraph 14 hereof.


 


In
order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in
recognition of the benefit that such IPO will confer upon the undersigned, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees with the Company as follows:


 


1.
If the Company solicits approval of its stockholders of a Business Combination, the undersigned will vote all shares of Common
Stock beneficially owned by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.


 


2.
(a) Unless the Company’s stockholders are previously given the option to redeem their shares in connection with amending
applicable documents to extend the time that the Company has to complete a Business Combination and that the Company fails to
consummate a Business Combination within 12 months from the closing of the Company’s IPO (or, in the event that the Company
extended the period of time to consummate a business combination up to three times, each by an additional three months, within
21 months) from the closing of the Company’s IPO, the undersigned shall take all reasonable steps to (i) cause the Trust
Fund to be liquidated and distributed to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably
practicable.


 



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(b)
The undersigned hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund
and any remaining net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares (“Claim”)
and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements
with the Company and will not seek recourse against the Trust Fund for any reason whatsoever.


 


[(c)
Intentionally Omitted.]


 


[(d)
Intentionally Omitted.]


 


3.
[Intentionally Omitted.]


 


4.
The undersigned will escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the
Company will enter into with the undersigned and an escrow agent acceptable to the Company.


 


5.
[Intentionally Omitted.]


 


6.
In order to minimize potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present
to the Company for its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire
a target business, until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company,
subject to any pre-existing fiduciary and contractual obligations the undersigned might have.


 


7.
(a) The undersigned acknowledges and agrees that prior to entering into a Business Combination with a target business that is
affiliated with any Insiders of the Company or their affiliates, including any company that is a portfolio company of, or otherwise
affiliated with, or has received financial investment from, an entity with which any Insider or their affiliates is affiliated,
such transaction must be approved by a majority of the Company’s disinterested independent directors and the Company must
obtain an opinion from an independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated
stockholders from a financial point of view.


 


(b)
The undersigned hereby agrees and acknowledges that (i) each of the Underwriters and the Company may be irreparably injured in
the event of a breach of any of the obligations contained in this letter, (ii) monetary damages may not be an adequate remedy
for such breach and (iii) the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that
such party may have in law or in equity, in the event of such breach.


 


8.
Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to
receive and will not accept any compensation or other cash payment prior to, or for services rendered in connection with, the
consummation of the Business Combination; provided that the Company shall be allowed to repay working capital loans made
by the undersigned to the Company in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned
and any affiliate of the undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred
in connection with identifying, investigating and consummating a Business Combination.


 



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9.
Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to
receive or accept a finder’s fee or any other compensation in the event the undersigned, any member of the family of the
undersigned or any affiliate of the undersigned originates a Business Combination.


 


10.
The undersigned agrees to be a director/officer of the Company until the earlier of the consummation by the Company of a Business
Combination or the liquidation of the Company. The undersigned’s biographical information previously furnished to the Company
and the Representative is true and accurate in all material respects, does not omit any material information with respect to the
undersigned’s biography and contains all of the information required to be disclosed pursuant to Item 401 of Regulation
S-K, promulgated under the Securities Act of 1933. The undersigned’s FINRA Questionnaire previously furnished to the Company
and the Representative is true and accurate in all material respects. The undersigned represents and warrants that:


 


		(a)	He,
                                         she or it has never had a petition under the federal bankruptcy laws or any state insolvency
                                         law been filed by or against (i) him, her or it, or any partnership in which he or she
                                         was a general partner at or within two years before the time of filing; or (ii) any corporation
                                         or business association of which he or she was an executive officer at or within two
                                         years before the time of such filing;



 


		(b)	He,
                                         she or it has never had a receiver, fiscal agent or similar officer been appointed by
                                         a court for his business or property, or any such partnership;



 


		(c)	He,
                                         she or it has never been convicted of fraud in a civil or criminal proceeding;



 


		(d)	He,
                                         she or it has never been convicted in a criminal proceeding or named the subject of a
                                         pending criminal proceeding (excluding traffic violations and minor offenses);



 


		(e)	He,
                                         she or it has never been the subject of any order, judgment or decree, not subsequently
                                         reversed, suspended or vacated, of any court of competent jurisdiction, permanently or
                                         temporarily enjoining or otherwise limiting him, her or it from (i) acting as a futures
                                         commission merchant, introducing broker, commodity trading advisor, commodity pool operator,
                                         floor broker, leverage transaction merchant, any other person regulated by the Commodity
                                         Futures Trading Commission (“CFTC”) or an associated person of any of the
                                         foregoing, or as an investment adviser, underwriter, broker or dealer in securities,
                                         or as an affiliated person, director or employee of any investment company, bank, savings
                                         and loan association or insurance company, or from engaging in or continuing any conduct
                                         or practice in connection with any such activity; or (ii) engaging in any type of
                                         business practice; or (iii) engaging in any activity in connection with the purchase
                                         or sale of any security or commodity or in connection with any violation of federal or
                                         state securities or federal commodities laws;



 



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		(f)	He,
                                         she, or it has never been the subject of any order, judgment or decree, not subsequently
                                         reversed, suspended or vacated, of any federal or state authority barring, suspending
                                         or otherwise limiting for more than 60 days his, her or its right to engage in any activity
                                         described in 10(e)(i) above, or to be associated with persons engaged in any such activity;



 


		(g)	He,
                                         she, or it has never been found by a court of competent jurisdiction in a civil action
                                         or by the SEC to have violated any federal or state securities law, where the judgment
                                         in such civil action or finding by the SEC has not been subsequently reversed, suspended
                                         or vacated;



 


		(h)	He,
                                         she, or it has never been found by a court of competent jurisdiction in a civil action
                                         or by the CFTC to have violated any federal commodities law, where the judgment in such
                                         civil action or finding by the CFTC has not been subsequently reversed, suspended or
                                         vacated;



 


		(i)	He,
                                         she, or it has never been the subject of, or a party to, any Federal, State or foreign
                                         judicial or administrative order, judgment, decree or finding, not subsequently reversed,
                                         suspended or vacated, relating to an alleged violation of (i) any Federal, State or foreign
                                         securities or commodities law or regulation, (ii) any law or regulation respecting financial
                                         institutions or insurance companies including, but not limited to, a temporary or permanent
                                         injunction, order of disgorgement or restitution, civil money penalty or temporary or
                                         permanent cease-and desist order, or removal or prohibition order or (iii) any law or
                                         regulation prohibiting mail or wire fraud or fraud in connection with any business entity;



 


		(j)	He,
                                         she or it has never been the subject of, or party to, any sanction or order, not subsequently
                                         reversed, suspended or vacated, or any self-regulatory organization, any registered entity,
                                         or any equivalent exchange, association, entity or organization that has disciplinary
                                         authority over its members or persons associated with a member;



 


		(k)	He,
                                         she or it has never been convicted of any felony or misdemeanor: (i) in connection with
                                         the purchase or sale of any security; (ii) involving the making of any false filing with
                                         the SEC; or (iii) arising out of the conduct of the business of an underwriter, broker,
                                         dealer, municipal securities dealer, investment advisor or paid solicitor of purchasers
                                         of securities;



 


		(l)	He,
                                         she or it was never subject to a final order of a state or foreign securities commission
                                         (or an agency of officer of a state performing like functions); a state or foreign authority
                                         that supervises or examines banks, savings associations, or credit unions; a state or
                                         foreign insurance commission (or an agency or officer of a state performing like functions);
                                         an appropriate federal or foreign banking agency; the CFTC; or the National Credit Union
                                         Administration that is based on a violation of any law or regulation that prohibits fraudulent,
                                         manipulative, or deceptive conduct;



 



    13


     


    

 


		(m)	He,
                                         she or it has never been subject to any order, judgment or decree of any court of competent
                                         jurisdiction, that, at the time of the sale of the Units, restrained or enjoined him,
                                         her or it from engaging or continuing to engage in any conduct or practice: (i) in connection
                                         with the purchase or sale of any security; (ii) involving the making of any false filing
                                         with the SEC or any foreign regulatory agency with similar functions; or (iii) arising
                                         out of the conduct of the business of an underwriter, broker, dealer, municipal securities
                                         dealer, investment adviser or paid solicitor of purchasers of securities;



 


		(n)	He,
                                         she or it has never been subject to any order of the SEC or any foreign regulatory agency
                                         with similar functions that orders him, her or it to cease and desist from committing
                                         or causing a future violation of: (i) any scienter-based anti-fraud provision of the
                                         federal securities laws, including, but not limited to, Section 17(a)(1) of the Securities
                                         Act, Section 10(b) of the Exchange Act and Rule 10b-5 thereunder, Section 15(c) and Section
                                         206(1) of the Advisers Act or any other rule or regulation thereunder; or (ii) Section
                                         5 of the Securities Act;



 


		(o)	He,
                                         she or it has never filed (as a registrant or issuer), or been named as an underwriter
                                         in any registration statement or Regulation A offering statement filed with the SEC that
                                         was the subject of a refusal order, stop order, or order suspending the Regulation A
                                         exemption, or is, currently, the subject of an investigation or proceeding to determine
                                         whether a stop order or suspension order should be issued;



 


		(p)	He,
                                         she or it has never been subject to a United States Postal Service false representation
                                         order, or is currently subject to a temporary restraining order or preliminary injunction
                                         with respect to conduct alleged by the United States Postal Service to constitute a scheme
                                         or device for obtaining money or property through the mail by means of false representations;



 


		(q)	He,
                                         she or it is not subject to a final order of a state securities commission (or an agency
                                         of officer of a state performing like functions); a state authority that supervises or
                                         examines banks, savings associations, or credit unions; a state insurance commission
                                         (or an agency or officer of a state performing like functions); an appropriate federal
                                         banking agency; the CFTC; or the National Credit Union Administration that bars the undersigned
                                         from: (i) association with an entity regulated by such commission, authority, agency
                                         or officer; (ii) engaging in the business of securities, insurance or banking; or (iii)
                                         engaging in savings association or credit union activities;



 



    14


     


    

 


		(r)	He,
                                         she or it is not subject to an order of the SEC entered pursuant to section 15(b) or
                                         15B(c) of the Securities Exchange Act of 1934 (the “Exchange Act”) or section
                                         203(e) or 203(f) of the Investment Advisers Act of 1940 (the “Advisers Act”)
                                         that: (i) suspends or revokes the undersigned’s registration as a broker, dealer,
                                         municipal securities dealer or investment adviser; (ii) places limitations on the activities,
                                         functions or operations of, or imposes civil money penalties on, such person; or (iii)
                                         bars the undersigned from being associated with any entity or from participating in the
                                         offering of any penny stock; and



 


		(s)	He,
                                         she or it has never been suspended or expelled from membership in, or suspended or barred
                                         from association with a member of, a securities self-regulatory organization (e.g., a
                                         registered national securities exchange or a registered national or affiliated securities
                                         association) for any act or omission to act constituting conduct inconsistent with just
                                         and equitable principles of trade.



 


 


11.
The undersigned has full right and power, without violating any agreement by which he, she or it is bound, to enter into this
letter agreement and to serve as a Director and/or officer of the Company.


 


12.
The undersigned hereby waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned
or to be owned by the undersigned, directly or indirectly (or to sell such shares to the Company in a tender offer), whether purchased
by the undersigned prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption
with respect to or otherwise sell, such shares in connection with any vote to approve a Business Combination with respect thereto,
a vote to amend the provisions of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by
the Company prior to a Business Combination.


 


13.
The undersigned hereby agrees to not propose, or vote in favor of, an amendment to the Company’s Amended and Restated Certificate
of Incorporation with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business
Combination unless the Company offers holders of IPO Shares the right to receive their pro rata portion of the funds then held
in the Trust Fund.


 


14.
In connection with Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed
by, and construed in accordance with, the laws of the State of New York without regard to principles of conflicts of law that
would result in the application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding
or claim arising out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration
in accordance with the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration
shall be brought before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be
conducted in English and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that
the arbitrator panel’s decision shall be final and enforceable by any court having jurisdiction over the party from whom
enforcement is sought. The cost of such arbitrators and arbitration services, together with the prevailing party’s legal
fees and expenses, shall be borne by the non-prevailing party or as otherwise directed by the arbitrators.


 



    15


     


    

 


15.
As used herein, (i) a “Business Combination” shall mean a merger, share exchange, asset acquisition,
contractual arrangement, share purchase, recapitalization, reorganization or other similar business combination with one or more
businesses or entities; (ii) “Insiders” shall mean all officers, directors and stockholders of the Company
immediately prior to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of
the Company acquired by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO
Shares” shall mean the shares of Common Stock issued in the Company’s IPO; (v) [Intentionally Omitted;] (vi)
“Registration Statement” means the registration statement on Form S-1 filed by the Company with respect
to the IPO; and (vii) “Trust Fund” shall mean the trust fund into which a portion of the net proceeds
of the Company’s IPO will be deposited.


 


16.
Any notice, consent or request to be given in connection with any of the terms or provisions of this letter agreement shall be
in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested),
by hand delivery or facsimile transmission.


 


If
to the Representative:


 


Chardan
Capital Markets, LLC


17
State Street, Suite 1600


New
York, NY 10004


Attn:
George Kaufman


Facsimile:
(646) 465-9039


 


with
a copy (which copy shall not constitute notice) to:


 


Ellenoff
Grossman & Schole LLP 


1345
Avenue of the Americas


New
York, New York 10105


Attn:
Stuart Neuhauser, Esq. and Ari Edelman, Esq.


Facsimile.:
(212) 370-7889


 


If
to the Company:


 


Orisun
Acquisition Corp.


555
Madison Avenue, Room 543


New
York, NY 10022


Attn:
Wei Chen, Chief Executive Officer


 


with
a copy (which copy shall not constitute notice) to:


 


Loeb
& Loeb LLP


345
Park Avenue


New
York, NY 10154


Attn:
Giovanni Caruso, Esq.


Facsimile:
(212) 504-3013


 



    16


     


    

 


17.
No party hereto may assign either this letter agreement or any of its rights, interests, or obligations hereunder without the
prior written consent of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual
and shall not operate to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding
on the parties hereto and any successors and assigns thereof.


 


18.
This Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter
hereof and supersedes all prior understandings, agreements, or representations by or among the parties hereto, written or oral,
to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement
may not be changed, amended, modified or waived (other than to correct a typographical error) as to any particular provision,
except by a written instrument executed by all parties hereto.


 


19.
The undersigned acknowledges and understands that the Underwriters and the Company will rely upon the agreements, representations
and warranties set forth herein in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters
a representative of, or a fiduciary with respect to, the Company, its stockholders or any creditor or vendor of the Company with
respect to the subject matter hereof.


 




    17


     


    

 


	 	/s/
    Lihua     Zheng
	 	Lihua
    Zheng


 


 


 


 


 


Signature
Page to Insider Letter


 



    18


     


    

 


August 2, 2019


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


 


Chardan Capital Markets,
LLC


17 State Street, Suite 1600


New York, NY 10004


 


		Re:	Initial Public Offering



 


Ladies and Gentlemen:


 


This letter is
being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered
into by and between Orisun Acquisition Corp., a Delaware corporation (the “Company”), and Chardan Capital
Markets, LLC, as Representative (the “Representative”) of the several underwriters named on Schedule
A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”)
of the Company’s units (the “Units”), each comprised of one share of common stock of the Company,
par value $0.00001 per share (the “Common Stock”), one redeemable warrant, each warrant entitling its
holder to purchase one-half (1/2) of a share of Common Stock at an exercise price of $11.50 per full share (the “Warrants”),
and one right to receive one-tenth (1/10) of a share of Common Stock (the “Rights”). Certain capitalized
terms used herein are defined in paragraph 14 hereof.


 


In order to induce the
Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit
that such IPO will confer upon the undersigned, and for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby agrees with the Company as follows:


 


1. If the Company solicits
approval of its stockholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned
by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.


 


2. (a) Unless the Company’s
stockholders are previously given the option to redeem their shares in connection with amending applicable documents to extend
the time that the Company has to complete a Business Combination and that the Company fails to consummate a Business Combination
within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to
consummate a business combination up to three times, each by an additional three months, within 21 months) from the closing of
the Company’s IPO, the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed
to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.


 



    19


     


    

 


(b) The undersigned
hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining
net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares (“Claim”)
and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements
with the Company and will not seek recourse against the Trust Fund for any reason whatsoever.


 


[(c) Intentionally
Omitted.]


 


[(d) Intentionally
Omitted.]


 


3. [Intentionally Omitted.]


 


4. The undersigned will
escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into
with the undersigned and an escrow agent acceptable to the Company.


 


5. [Intentionally Omitted.]


 


6. In order to minimize
potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for
its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business,
until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any
pre-existing fiduciary and contractual obligations the undersigned might have.


 


7. (a) The undersigned
acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders
of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has
received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be
approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an
independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated stockholders from
a financial point of view.


 


(b) The undersigned
hereby agrees and acknowledges that (i) each of the Underwriters and the Company may be irreparably injured in the event of a breach
of any of the obligations contained in this letter, (ii) monetary damages may not be an adequate remedy for such breach and (iii)
the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law
or in equity, in the event of such breach.


 



    20


     


    

 


8. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept
any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business
Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company
in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the
undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying,
investigating and consummating a Business Combination.


 


9. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s
fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the
undersigned originates a Business Combination.


 


10. The undersigned agrees
to be a director/officer of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation
of the Company. The undersigned’s biographical information previously furnished to the Company and the Representative is
true and accurate in all material respects, does not omit any material information with respect to the undersigned’s biography
and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities
Act of 1933. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative is true and
accurate in all material respects. The undersigned represents and warrants that:


 


		(a)	He, she or it has never had a petition under the federal bankruptcy laws or any state insolvency law been filed by or against
(i) him, her or it, or any partnership in which he or she was a general partner at or within two years before the time of filing;
or (ii) any corporation or business association of which he or she was an executive officer at or within two years before the time
of such filing;



 


		(b)	He, she or it has never had a receiver, fiscal agent or similar officer been appointed by a court for his business or property,
or any such partnership;



 


		(c)	He, she or it has never been convicted of fraud in a civil or criminal proceeding;



 


		(d)	He, she or it has never been convicted in a criminal proceeding or named the subject of a pending criminal proceeding (excluding
traffic violations and minor offenses);



 


		(e)	He, she or it has never been the subject of any order, judgment or decree, not subsequently reversed, suspended or vacated,
of any court of competent jurisdiction, permanently or temporarily enjoining or otherwise limiting him, her or it from (i) acting
as a futures commission merchant, introducing broker, commodity trading advisor, commodity pool operator, floor broker, leverage
transaction merchant, any other person regulated by the Commodity Futures Trading Commission (“CFTC”) or an associated
person of any of the foregoing, or as an investment adviser, underwriter, broker or dealer in securities, or as an affiliated person,
director or employee of any investment company, bank, savings and loan association or insurance company, or from engaging in or
continuing any conduct or practice in connection with any such activity; or (ii) engaging in any type of business practice;
or (iii) engaging in any activity in connection with the purchase or sale of any security or commodity or in connection with
any violation of federal or state securities or federal commodities laws;



 



    21


     


    

 


		(f)	He, she, or it has never been the subject of any order, judgment or decree, not subsequently reversed, suspended or vacated,
of any federal or state authority barring, suspending or otherwise limiting for more than 60 days his, her or its right to engage
in any activity described in 10(e)(i) above, or to be associated with persons engaged in any such activity;



 


		(g)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by the SEC to have violated any
federal or state securities law, where the judgment in such civil action or finding by the SEC has not been subsequently reversed,
suspended or vacated;



 


		(h)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by the CFTC to have violated
any federal commodities law, where the judgment in such civil action or finding by the CFTC has not been subsequently reversed,
suspended or vacated;



 


		(i)	He, she, or it has never been the subject of, or a party to, any Federal, State or foreign judicial or administrative order,
judgment, decree or finding, not subsequently reversed, suspended or vacated, relating to an alleged violation of (i) any Federal,
State or foreign securities or commodities law or regulation, (ii) any law or regulation respecting financial institutions or insurance
companies including, but not limited to, a temporary or permanent injunction, order of disgorgement or restitution, civil money
penalty or temporary or permanent cease-and desist order, or removal or prohibition order or (iii) any law or regulation prohibiting
mail or wire fraud or fraud in connection with any business entity;



 


		(j)	He, she or it has never been the subject of, or party to, any sanction or order, not subsequently reversed, suspended or vacated,
or any self-regulatory organization, any registered entity, or any equivalent exchange, association, entity or organization that
has disciplinary authority over its members or persons associated with a member;



 


		(k)	He, she or it has never been convicted of any felony or misdemeanor: (i) in connection with the purchase or sale of any security;
(ii) involving the making of any false filing with the SEC; or (iii) arising out of the conduct of the business of an underwriter,
broker, dealer, municipal securities dealer, investment advisor or paid solicitor of purchasers of securities;



 



    22


     


    

 


		(l)	He, she or it was never subject to a final order of a state or foreign securities commission (or an agency of officer of a
state performing like functions); a state or foreign authority that supervises or examines banks, savings associations, or credit
unions; a state or foreign insurance commission (or an agency or officer of a state performing like functions); an appropriate
federal or foreign banking agency; the CFTC; or the National Credit Union Administration that is based on a violation of any law
or regulation that prohibits fraudulent, manipulative, or deceptive conduct;



 


		(m)	He, she or it has never been subject to any order, judgment or decree of any court of competent jurisdiction, that, at the
time of the sale of the Units, restrained or enjoined him, her or it from engaging or continuing to engage in any conduct or practice:
(i) in connection with the purchase or sale of any security; (ii) involving the making of any false filing with the SEC or any
foreign regulatory agency with similar functions; or (iii) arising out of the conduct of the business of an underwriter, broker,
dealer, municipal securities dealer, investment adviser or paid solicitor of purchasers of securities;



 


		(n)	He, she or it has never been subject to any order of the SEC or any foreign regulatory agency with similar functions that orders
him, her or it to cease and desist from committing or causing a future violation of: (i) any scienter-based anti-fraud provision
of the federal securities laws, including, but not limited to, Section 17(a)(1) of the Securities Act, Section 10(b) of the Exchange
Act and Rule 10b-5 thereunder, Section 15(c) and Section 206(1) of the Advisers Act or any other rule or regulation thereunder;
or (ii) Section 5 of the Securities Act;



 


		(o)	He, she or it has never filed (as a registrant or issuer), or been named as an underwriter in any registration statement or
Regulation A offering statement filed with the SEC that was the subject of a refusal order, stop order, or order suspending the
Regulation A exemption, or is, currently, the subject of an investigation or proceeding to determine whether a stop order or suspension
order should be issued;



 


		(p)	He, she or it has never been subject to a United States Postal Service false representation order, or is currently subject
to a temporary restraining order or preliminary injunction with respect to conduct alleged by the United States Postal Service
to constitute a scheme or device for obtaining money or property through the mail by means of false representations;



 


		(q)	He, she or it is not subject to a final order of a state securities commission (or an agency of officer of a state performing
like functions); a state authority that supervises or examines banks, savings associations, or credit unions; a state insurance
commission (or an agency or officer of a state performing like functions); an appropriate federal banking agency; the CFTC; or
the National Credit Union Administration that bars the undersigned from: (i) association with an entity regulated by such commission,
authority, agency or officer; (ii) engaging in the business of securities, insurance or banking; or (iii) engaging in savings association
or credit union activities;



 



    23


     


    

 


		(r)	He, she or it is not subject to an order of the SEC entered pursuant to section 15(b) or 15B(c) of the Securities Exchange
Act of 1934 (the “Exchange Act”) or section 203(e) or 203(f) of the Investment Advisers Act of 1940 (the “Advisers
Act”) that: (i) suspends or revokes the undersigned’s registration as a broker, dealer, municipal securities dealer
or investment adviser; (ii) places limitations on the activities, functions or operations of, or imposes civil money penalties
on, such person; or (iii) bars the undersigned from being associated with any entity or from participating in the offering of any
penny stock; and



 


		(s)	He, she or it has never been suspended or expelled from membership in, or suspended or barred from association with a member
of, a securities self-regulatory organization (e.g., a registered national securities exchange or a registered national or affiliated
securities association) for any act or omission to act constituting conduct inconsistent with just and equitable principles of
trade.



 


 


11. The undersigned has
full right and power, without violating any agreement by which he, she or it is bound, to enter into this letter agreement and
to serve as a Director and/or officer of the Company.


 


12. The undersigned hereby
waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the
undersigned, directly or indirectly (or to sell such shares to the Company in a tender offer), whether purchased by the undersigned
prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise
sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions
of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business
Combination.


 


13. The undersigned hereby
agrees to not propose, or vote in favor of, an amendment to the Company’s Amended and Restated Certificate of Incorporation
with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless
the Company offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.


 


14. In connection with
Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the
application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising
out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with
the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought
before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English
and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s
decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost
of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne
by the non-prevailing party or as otherwise directed by the arbitrators.


 



    24


     


    

 


15. As used herein, (i)
a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement,
share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities;
(ii) “Insiders” shall mean all officers, directors and stockholders of the Company immediately prior
to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired
by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares”
shall mean the shares of Common Stock issued in the Company’s IPO; (v) [Intentionally Omitted;] (vi) “Registration
Statement” means the registration statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust
Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.


 


16. Any notice, consent
or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall
be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile
transmission.


 


If to the Representative:


 


Chardan Capital Markets, LLC


17 State Street, Suite 1600


New York, NY 10004


Attn: George Kaufman


Facsimile: (646) 465-9039


 


with a copy (which copy shall not constitute
notice) to:


 


Ellenoff Grossman & Schole LLP 


1345 Avenue of the Americas


New York, New York 10105


Attn: Stuart Neuhauser, Esq. and Ari Edelman, Esq.


Facsimile.: (212) 370-7889


 


If to the Company:


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


Attn: Wei Chen, Chief Executive Officer


 



    25


     


    

 


with a copy (which copy shall not constitute
notice) to:


 


Loeb & Loeb LLP


345 Park Avenue


New York, NY 10154


Attn: Giovanni Caruso, Esq.


Facsimile: (212) 504-3013


 


17. No party hereto may
assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent
of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate
to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto
and any successors and assigns thereof.


 


18. This Letter Agreement
constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate
in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may not be changed, amended,
modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument
executed by all parties hereto.


 


19. The undersigned acknowledges
and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein
in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters a representative of, or a fiduciary
with respect to, the Company, its stockholders or any creditor or vendor of the Company with respect to the subject matter hereof.


 




    26


     


    

 


	 	/s/ Ling Wu
	 	Ling Wu


 


 


 


 


 



Signature Page to Insider Letter


 



    27


     


    

 


August 2, 2019


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


 


Chardan Capital Markets,
LLC


17 State Street, Suite 1600


New York, NY 10004


 


		Re:	Initial Public Offering



 


Ladies and Gentlemen:


 


This letter is
being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered
into by and between Orisun Acquisition Corp., a Delaware corporation (the “Company”), and Chardan Capital
Markets, LLC, as Representative (the “Representative”) of the several underwriters named on Schedule
A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”)
of the Company’s units (the “Units”), each comprised of one share of common stock of the Company,
par value $0.00001 per share (the “Common Stock”), one redeemable warrant, each warrant entitling its
holder to purchase one-half (1/2) of a share of Common Stock at an exercise price of $11.50 per full share (the “Warrants”),
and one right to receive one-tenth (1/10) of a share of Common Stock (the “Rights”). Certain capitalized
terms used herein are defined in paragraph 14 hereof.


 


In order to induce the
Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit
that such IPO will confer upon the undersigned, and for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby agrees with the Company as follows:


 


1. If the Company solicits
approval of its stockholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned
by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.


 


2. (a) Unless the Company’s
stockholders are previously given the option to redeem their shares in connection with amending applicable documents to extend
the time that the Company has to complete a Business Combination and that the Company fails to consummate a Business Combination
within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to
consummate a business combination up to three times, each by an additional three months, within 21 months) from the closing of
the Company’s IPO, the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed
to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.


 



    28


     


    

 


(b) The undersigned
hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining
net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares (“Claim”)
and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements
with the Company and will not seek recourse against the Trust Fund for any reason whatsoever.


 


[(c) Intentionally
Omitted.]


 


[(d) Intentionally
Omitted.]


 


3. [Intentionally Omitted.]


 


4. The undersigned will
escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into
with the undersigned and an escrow agent acceptable to the Company.


 


5. [Intentionally Omitted.]


 


6. In order to minimize
potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for
its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business,
until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any
pre-existing fiduciary and contractual obligations the undersigned might have.


 


7. (a) The undersigned
acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders
of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has
received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be
approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an
independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated stockholders from
a financial point of view.


 


(b) The undersigned
hereby agrees and acknowledges that (i) each of the Underwriters and the Company may be irreparably injured in the event of a breach
of any of the obligations contained in this letter, (ii) monetary damages may not be an adequate remedy for such breach and (iii)
the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law
or in equity, in the event of such breach.


 



    29


     


    

 


8. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept
any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business
Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company
in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the
undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying,
investigating and consummating a Business Combination.


 


9. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s
fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the
undersigned originates a Business Combination.


 


10. The undersigned agrees
to be a director/officer of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation
of the Company. The undersigned’s biographical information previously furnished to the Company and the Representative is
true and accurate in all material respects, does not omit any material information with respect to the undersigned’s biography
and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities
Act of 1933. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative is true and
accurate in all material respects. The undersigned represents and warrants that:


 


		(a)	He, she or it has never had a petition under the federal bankruptcy laws or any state insolvency
law been filed by or against (i) him, her or it, or any partnership in which he or she was a general partner at or within two years
before the time of filing; or (ii) any corporation or business association of which he or she was an executive officer at or within
two years before the time of such filing;



 


		(b)	He, she or it has never had a receiver, fiscal agent or similar officer been appointed by a court
for his business or property, or any such partnership;



 


		(c)	He, she or it has never been convicted of fraud in a civil or criminal proceeding;



 


		(d)	He, she or it has never been convicted in a criminal proceeding or named the subject of a pending
criminal proceeding (excluding traffic violations and minor offenses);



 


		(e)	He, she or it has never been the subject of any order, judgment or decree, not subsequently reversed,
suspended or vacated, of any court of competent jurisdiction, permanently or temporarily enjoining or otherwise limiting him, her
or it from (i) acting as a futures commission merchant, introducing broker, commodity trading advisor, commodity pool operator,
floor broker, leverage transaction merchant, any other person regulated by the Commodity Futures Trading Commission (“CFTC”)
or an associated person of any of the foregoing, or as an investment adviser, underwriter, broker or dealer in securities, or as
an affiliated person, director or employee of any investment company, bank, savings and loan association or insurance company,
or from engaging in or continuing any conduct or practice in connection with any such activity; or (ii) engaging in any type
of business practice; or (iii) engaging in any activity in connection with the purchase or sale of any security or commodity
or in connection with any violation of federal or state securities or federal commodities laws;



 



    30


     


    

 


		(f)	He, she, or it has never been the subject of any order, judgment or decree, not subsequently reversed,
suspended or vacated, of any federal or state authority barring, suspending or otherwise limiting for more than 60 days his, her
or its right to engage in any activity described in 10(e)(i) above, or to be associated with persons engaged in any such activity;



 


		(g)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by
the SEC to have violated any federal or state securities law, where the judgment in such civil action or finding by the SEC has
not been subsequently reversed, suspended or vacated;



 


		(h)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by
the CFTC to have violated any federal commodities law, where the judgment in such civil action or finding by the CFTC has not been
subsequently reversed, suspended or vacated;



 


		(i)	He, she, or it has never been the subject of, or a party to, any Federal, State or foreign judicial
or administrative order, judgment, decree or finding, not subsequently reversed, suspended or vacated, relating to an alleged violation
of (i) any Federal, State or foreign securities or commodities law or regulation, (ii) any law or regulation respecting financial
institutions or insurance companies including, but not limited to, a temporary or permanent injunction, order of disgorgement or
restitution, civil money penalty or temporary or permanent cease-and desist order, or removal or prohibition order or (iii) any
law or regulation prohibiting mail or wire fraud or fraud in connection with any business entity;



 


		(j)	He, she or it has never been the subject of, or party to, any sanction or order, not subsequently
reversed, suspended or vacated, or any self-regulatory organization, any registered entity, or any equivalent exchange, association,
entity or organization that has disciplinary authority over its members or persons associated with a member;



 


		(k)	He, she or it has never been convicted of any felony or misdemeanor: (i) in connection with the
purchase or sale of any security; (ii) involving the making of any false filing with the SEC; or (iii) arising out of the conduct
of the business of an underwriter, broker, dealer, municipal securities dealer, investment advisor or paid solicitor of purchasers
of securities;



 



    31


     


    

 


		(l)	He, she or it was never subject to a final order of a state or foreign securities commission (or
an agency of officer of a state performing like functions); a state or foreign authority that supervises or examines banks, savings
associations, or credit unions; a state or foreign insurance commission (or an agency or officer of a state performing like functions);
an appropriate federal or foreign banking agency; the CFTC; or the National Credit Union Administration that is based on a violation
of any law or regulation that prohibits fraudulent, manipulative, or deceptive conduct;



 


		(m)	He, she or it has never been subject to any order, judgment or decree of any court of competent
jurisdiction, that, at the time of the sale of the Units, restrained or enjoined him, her or it from engaging or continuing to
engage in any conduct or practice: (i) in connection with the purchase or sale of any security; (ii) involving the making of any
false filing with the SEC or any foreign regulatory agency with similar functions; or (iii) arising out of the conduct of the business
of an underwriter, broker, dealer, municipal securities dealer, investment adviser or paid solicitor of purchasers of securities;



 


		(n)	He, she or it has never been subject to any order of the SEC or any foreign regulatory agency with
similar functions that orders him, her or it to cease and desist from committing or causing a future violation of: (i) any scienter-based
anti-fraud provision of the federal securities laws, including, but not limited to, Section 17(a)(1) of the Securities Act, Section
10(b) of the Exchange Act and Rule 10b-5 thereunder, Section 15(c) and Section 206(1) of the Advisers Act or any other rule or
regulation thereunder; or (ii) Section 5 of the Securities Act;



 


		(o)	He, she or it has never filed (as a registrant or issuer), or been named as an underwriter in any
registration statement or Regulation A offering statement filed with the SEC that was the subject of a refusal order, stop order,
or order suspending the Regulation A exemption, or is, currently, the subject of an investigation or proceeding to determine whether
a stop order or suspension order should be issued;



 


		(p)	He, she or it has never been subject to a United States Postal Service false representation order,
or is currently subject to a temporary restraining order or preliminary injunction with respect to conduct alleged by the United
States Postal Service to constitute a scheme or device for obtaining money or property through the mail by means of false representations;



 


		(q)	He, she or it is not subject to a final order of a state securities commission (or an agency of
officer of a state performing like functions); a state authority that supervises or examines banks, savings associations, or credit
unions; a state insurance commission (or an agency or officer of a state performing like functions); an appropriate federal banking
agency; the CFTC; or the National Credit Union Administration that bars the undersigned from: (i) association with an entity regulated
by such commission, authority, agency or officer; (ii) engaging in the business of securities, insurance or banking; or (iii) engaging
in savings association or credit union activities;



 



    32


     


    

 


		(r)	He, she or it is not subject to an order of the SEC entered pursuant to section 15(b) or 15B(c)
of the Securities Exchange Act of 1934 (the “Exchange Act”) or section 203(e) or 203(f) of the Investment Advisers
Act of 1940 (the “Advisers Act”) that: (i) suspends or revokes the undersigned’s registration as a broker, dealer,
municipal securities dealer or investment adviser; (ii) places limitations on the activities, functions or operations of, or imposes
civil money penalties on, such person; or (iii) bars the undersigned from being associated with any entity or from participating
in the offering of any penny stock; and



 


		(s)	He, she or it has never been suspended or expelled from membership in, or suspended or barred from
association with a member of, a securities self-regulatory organization (e.g., a registered national securities exchange or a registered
national or affiliated securities association) for any act or omission to act constituting conduct inconsistent with just and equitable
principles of trade.



 


 


11. The undersigned has
full right and power, without violating any agreement by which he, she or it is bound, to enter into this letter agreement and
to serve as a Director and/or officer of the Company.


 


12. The undersigned hereby
waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the
undersigned, directly or indirectly (or to sell such shares to the Company in a tender offer), whether purchased by the undersigned
prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise
sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions
of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business
Combination.


 


13. The undersigned hereby
agrees to not propose, or vote in favor of, an amendment to the Company’s Amended and Restated Certificate of Incorporation
with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless
the Company offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.


 


14. In connection with
Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the
application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising
out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with
the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought
before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English
and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s
decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost
of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne
by the non-prevailing party or as otherwise directed by the arbitrators.


 



    33


     


    

 


15. As used herein, (i)
a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement,
share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities;
(ii) “Insiders” shall mean all officers, directors and stockholders of the Company immediately prior
to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired
by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares”
shall mean the shares of Common Stock issued in the Company’s IPO; (v) [Intentionally Omitted;] (vi) “Registration
Statement” means the registration statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust
Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.


 


16. Any notice, consent
or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall
be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile
transmission.


 


If to the Representative:


 


Chardan Capital Markets, LLC


17 State Street, Suite 1600


New York, NY 10004


Attn: George Kaufman


Facsimile: (646) 465-9039


 


with a copy (which copy shall not constitute
notice) to:


 


Ellenoff Grossman & Schole LLP 


1345 Avenue of the Americas


New York, New York 10105


Attn: Stuart Neuhauser, Esq. and Ari Edelman, Esq.


Facsimile.: (212) 370-7889


 


If to the Company:


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


Attn: Wei Chen, Chief Executive Officer


 



    34


     


    

 


with a copy (which copy shall not constitute
notice) to:


 


Loeb & Loeb LLP


345 Park Avenue


New York, NY 10154


Attn: Giovanni Caruso, Esq.


Facsimile: (212) 504-3013


 


17. No party hereto may
assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent
of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate
to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto
and any successors and assigns thereof.


 


18. This Letter Agreement
constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate
in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may not be changed, amended,
modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument
executed by all parties hereto.


 


19. The undersigned acknowledges
and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein
in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters a representative of, or a fiduciary
with respect to, the Company, its stockholders or any creditor or vendor of the Company with respect to the subject matter hereof.


 




    35


     


    

 


	 	/s/
    Lu Zhou
	 	Lu Zhou 


 


 


 


 


 



Signature Page to Insider Letter


 



    36


     


    

 


August 2, 2019


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


 


Chardan Capital Markets,
LLC


17 State Street, Suite 1600


New York, NY 10004


 


		Re:	Initial Public Offering



 


Ladies and Gentlemen:


 


This letter is
being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered
into by and between Orisun Acquisition Corp., a Delaware corporation (the “Company”), and Chardan Capital
Markets, LLC, as Representative (the “Representative”) of the several underwriters named on Schedule
A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”)
of the Company’s units (the “Units”), each comprised of one share of common stock of the Company,
par value $0.00001 per share (the “Common Stock”), one redeemable warrant, each warrant entitling its
holder to purchase one-half (1/2) of a share of Common Stock at an exercise price of $11.50 per full share (the “Warrants”),
and one right to receive one-tenth (1/10) of a share of Common Stock (the “Rights”). Certain capitalized
terms used herein are defined in paragraph 14 hereof.


 


In order to induce the
Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit
that such IPO will confer upon the undersigned, and for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby agrees with the Company as follows:


 


1. If the Company solicits
approval of its stockholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned
by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.


 


2. (a) Unless the Company’s
stockholders are previously given the option to redeem their shares in connection with amending applicable documents to extend
the time that the Company has to complete a Business Combination and that the Company fails to consummate a Business Combination
within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to
consummate a business combination up to three times, each by an additional three months, within 21 months) from the closing of
the Company’s IPO, the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed
to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.


 



    37


     


    

 


(b) The undersigned
hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining
net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares (“Claim”)
and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements
with the Company and will not seek recourse against the Trust Fund for any reason whatsoever.


 


[(c) Intentionally
Omitted.]


 


[(d) Intentionally
Omitted.]


 


3. [Intentionally Omitted.]


 


4. The undersigned will
escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into
with the undersigned and an escrow agent acceptable to the Company.


 


5. [Intentionally Omitted.]


 


6. In order to minimize
potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for
its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business,
until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any
pre-existing fiduciary and contractual obligations the undersigned might have.


 


7. (a) The undersigned
acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders
of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has
received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be
approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an
independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated stockholders from
a financial point of view.


 


(b) The undersigned
hereby agrees and acknowledges that (i) each of the Underwriters and the Company may be irreparably injured in the event of a breach
of any of the obligations contained in this letter, (ii) monetary damages may not be an adequate remedy for such breach and (iii)
the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law
or in equity, in the event of such breach.


 



    38


     


    

 


8. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept
any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business
Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company
in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the
undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying,
investigating and consummating a Business Combination.


 


9. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s
fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the
undersigned originates a Business Combination.


 


10. The undersigned agrees
to be a director/officer of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation
of the Company. The undersigned’s biographical information previously furnished to the Company and the Representative is
true and accurate in all material respects, does not omit any material information with respect to the undersigned’s biography
and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities
Act of 1933. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative is true and
accurate in all material respects. The undersigned represents and warrants that:


 


		(a)	He, she or it has never had a petition under the federal bankruptcy laws or any state insolvency
law been filed by or against (i) him, her or it, or any partnership in which he or she was a general partner at or within two years
before the time of filing; or (ii) any corporation or business association of which he or she was an executive officer at or within
two years before the time of such filing;



 


		(b)	He, she or it has never had a receiver, fiscal agent or similar officer been appointed by a court
for his business or property, or any such partnership;



 


		(c)	He, she or it has never been convicted of fraud in a civil or criminal proceeding;



 


		(d)	He, she or it has never been convicted in a criminal proceeding or named the subject of a pending
criminal proceeding (excluding traffic violations and minor offenses);



 


		(e)	He, she or it has never been the subject of any order, judgment or decree, not subsequently reversed,
suspended or vacated, of any court of competent jurisdiction, permanently or temporarily enjoining or otherwise limiting him, her
or it from (i) acting as a futures commission merchant, introducing broker, commodity trading advisor, commodity pool operator,
floor broker, leverage transaction merchant, any other person regulated by the Commodity Futures Trading Commission (“CFTC”)
or an associated person of any of the foregoing, or as an investment adviser, underwriter, broker or dealer in securities, or as
an affiliated person, director or employee of any investment company, bank, savings and loan association or insurance company,
or from engaging in or continuing any conduct or practice in connection with any such activity; or (ii) engaging in any type
of business practice; or (iii) engaging in any activity in connection with the purchase or sale of any security or commodity
or in connection with any violation of federal or state securities or federal commodities laws;



 



    39


     


    

 


		(f)	He, she, or it has never been the subject of any order, judgment or decree, not subsequently reversed,
suspended or vacated, of any federal or state authority barring, suspending or otherwise limiting for more than 60 days his, her
or its right to engage in any activity described in 10(e)(i) above, or to be associated with persons engaged in any such activity;



 


		(g)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by
the SEC to have violated any federal or state securities law, where the judgment in such civil action or finding by the SEC has
not been subsequently reversed, suspended or vacated;



 


		(h)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by
the CFTC to have violated any federal commodities law, where the judgment in such civil action or finding by the CFTC has not been
subsequently reversed, suspended or vacated;



 


		(i)	He, she, or it has never been the subject of, or a party to, any Federal, State or foreign judicial
or administrative order, judgment, decree or finding, not subsequently reversed, suspended or vacated, relating to an alleged violation
of (i) any Federal, State or foreign securities or commodities law or regulation, (ii) any law or regulation respecting financial
institutions or insurance companies including, but not limited to, a temporary or permanent injunction, order of disgorgement or
restitution, civil money penalty or temporary or permanent cease-and desist order, or removal or prohibition order or (iii) any
law or regulation prohibiting mail or wire fraud or fraud in connection with any business entity;



 


		(j)	He, she or it has never been the subject of, or party to, any sanction or order, not subsequently
reversed, suspended or vacated, or any self-regulatory organization, any registered entity, or any equivalent exchange, association,
entity or organization that has disciplinary authority over its members or persons associated with a member;



 


		(k)	He, she or it has never been convicted of any felony or misdemeanor: (i) in connection with the
purchase or sale of any security; (ii) involving the making of any false filing with the SEC; or (iii) arising out of the conduct
of the business of an underwriter, broker, dealer, municipal securities dealer, investment advisor or paid solicitor of purchasers
of securities;



 



    40


     


    

 


		(l)	He, she or it was never subject to a final order of a state or foreign securities commission (or
an agency of officer of a state performing like functions); a state or foreign authority that supervises or examines banks, savings
associations, or credit unions; a state or foreign insurance commission (or an agency or officer of a state performing like functions);
an appropriate federal or foreign banking agency; the CFTC; or the National Credit Union Administration that is based on a violation
of any law or regulation that prohibits fraudulent, manipulative, or deceptive conduct;



 


		(m)	He, she or it has never been subject to any order, judgment or decree of any court of competent
jurisdiction, that, at the time of the sale of the Units, restrained or enjoined him, her or it from engaging or continuing to
engage in any conduct or practice: (i) in connection with the purchase or sale of any security; (ii) involving the making of any
false filing with the SEC or any foreign regulatory agency with similar functions; or (iii) arising out of the conduct of the business
of an underwriter, broker, dealer, municipal securities dealer, investment adviser or paid solicitor of purchasers of securities;



 


		(n)	He, she or it has never been subject to any order of the SEC or any foreign regulatory agency with
similar functions that orders him, her or it to cease and desist from committing or causing a future violation of: (i) any scienter-based
anti-fraud provision of the federal securities laws, including, but not limited to, Section 17(a)(1) of the Securities Act, Section
10(b) of the Exchange Act and Rule 10b-5 thereunder, Section 15(c) and Section 206(1) of the Advisers Act or any other rule or
regulation thereunder; or (ii) Section 5 of the Securities Act;



 


		(o)	He, she or it has never filed (as a registrant or issuer), or been named as an underwriter in any
registration statement or Regulation A offering statement filed with the SEC that was the subject of a refusal order, stop order,
or order suspending the Regulation A exemption, or is, currently, the subject of an investigation or proceeding to determine whether
a stop order or suspension order should be issued;



 


		(p)	He, she or it has never been subject to a United States Postal Service false representation order,
or is currently subject to a temporary restraining order or preliminary injunction with respect to conduct alleged by the United
States Postal Service to constitute a scheme or device for obtaining money or property through the mail by means of false representations;



 


		(q)	He, she or it is not subject to a final order of a state securities commission (or an agency of
officer of a state performing like functions); a state authority that supervises or examines banks, savings associations, or credit
unions; a state insurance commission (or an agency or officer of a state performing like functions); an appropriate federal banking
agency; the CFTC; or the National Credit Union Administration that bars the undersigned from: (i) association with an entity regulated
by such commission, authority, agency or officer; (ii) engaging in the business of securities, insurance or banking; or (iii) engaging
in savings association or credit union activities;



 



    41


     


    

 


		(r)	He, she or it is not subject to an order of the SEC entered pursuant to section 15(b) or 15B(c)
of the Securities Exchange Act of 1934 (the “Exchange Act”) or section 203(e) or 203(f) of the Investment Advisers
Act of 1940 (the “Advisers Act”) that: (i) suspends or revokes the undersigned’s registration as a broker, dealer,
municipal securities dealer or investment adviser; (ii) places limitations on the activities, functions or operations of, or imposes
civil money penalties on, such person; or (iii) bars the undersigned from being associated with any entity or from participating
in the offering of any penny stock; and



 


		(s)	He, she or it has never been suspended or expelled from membership in, or suspended or barred from
association with a member of, a securities self-regulatory organization (e.g., a registered national securities exchange or a registered
national or affiliated securities association) for any act or omission to act constituting conduct inconsistent with just and equitable
principles of trade.



 


 


11. The undersigned has
full right and power, without violating any agreement by which he, she or it is bound, to enter into this letter agreement and
to serve as a Director and/or officer of the Company.


 


12. The undersigned hereby
waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the
undersigned, directly or indirectly (or to sell such shares to the Company in a tender offer), whether purchased by the undersigned
prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise
sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions
of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business
Combination.


 


13. The undersigned hereby
agrees to not propose, or vote in favor of, an amendment to the Company’s Amended and Restated Certificate of Incorporation
with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless
the Company offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.


 


14. In connection with
Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the
application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising
out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with
the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought
before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English
and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s
decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost
of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne
by the non-prevailing party or as otherwise directed by the arbitrators.


 



    42


     


    

 


15. As used herein, (i)
a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement,
share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities;
(ii) “Insiders” shall mean all officers, directors and stockholders of the Company immediately prior
to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired
by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares”
shall mean the shares of Common Stock issued in the Company’s IPO; (v) [Intentionally Omitted;] (vi) “Registration
Statement” means the registration statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust
Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.


 


16. Any notice, consent
or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall
be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile
transmission.


 


If to the Representative:


 


Chardan Capital Markets, LLC


17 State Street, Suite 1600


New York, NY 10004


Attn: George Kaufman


Facsimile: (646) 465-9039


 


with a copy (which copy shall not constitute
notice) to:


 


Ellenoff Grossman & Schole LLP 


1345 Avenue of the Americas


New York, New York 10105


Attn: Stuart Neuhauser, Esq. and Ari Edelman, Esq.


Facsimile.: (212) 370-7889


 


If to the Company:


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


Attn: Wei Chen, Chief Executive Officer


 



    43


     


    

 


with a copy (which copy shall not constitute
notice) to:


 


Loeb & Loeb LLP


345 Park Avenue


New York, NY 10154


Attn: Giovanni Caruso, Esq.


Facsimile: (212) 504-3013


 


17. No party hereto may
assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent
of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate
to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto
and any successors and assigns thereof.


 


18. This Letter Agreement
constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate
in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may not be changed, amended,
modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument
executed by all parties hereto.


 


19. The undersigned acknowledges
and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein
in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters a representative of, or a fiduciary
with respect to, the Company, its stockholders or any creditor or vendor of the Company with respect to the subject matter hereof.


 




    44


     


    

 


	 	/s/
    Tony Chi Ming Chan
	 	Tony Chi Ming Chan


 


 


 


 


 



Signature Page to Insider Letter


 



    45


     


    

 


August 2, 2019


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


 


Chardan Capital Markets,
LLC


17 State Street, Suite 1600


New York, NY 10004


 


		Re:	Initial Public Offering



 


Ladies and Gentlemen:


 


This letter is
being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered
into by and between Orisun Acquisition Corp., a Delaware corporation (the “Company”), and Chardan Capital
Markets, LLC, as Representative (the “Representative”) of the several underwriters named on Schedule
A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”)
of the Company’s units (the “Units”), each comprised of one share of common stock of the Company,
par value $0.00001 per share (the “Common Stock”), one redeemable warrant, each warrant entitling its
holder to purchase one-half (1/2) of a share of Common Stock at an exercise price of $11.50 per full share (the “Warrants”),
and one right to receive one-tenth (1/10) of a share of Common Stock (the “Rights”). Certain capitalized
terms used herein are defined in paragraph 14 hereof.


 


In order to induce the
Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit
that such IPO will confer upon the undersigned, and for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby agrees with the Company as follows:


 


1. If the Company solicits
approval of its stockholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned
by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.


 


2. (a) Unless the Company’s
stockholders are previously given the option to redeem their shares in connection with amending applicable documents to extend
the time that the Company has to complete a Business Combination and that the Company fails to consummate a Business Combination
within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to
consummate a business combination up to three times, each by an additional three months, within 21 months) from the closing of
the Company’s IPO, the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed
to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.


 



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(b) The undersigned
hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining
net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares (“Claim”)
and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements
with the Company and will not seek recourse against the Trust Fund for any reason whatsoever.


 


(c) In the event of
the liquidation of the Trust Fund, the undersigned agrees to indemnify and hold harmless the Company against any and all loss,
liability, claims, damage and expense whatsoever (including, but not limited to, any and all legal or other expenses reasonably
incurred in investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever)
which the Company may become subject as a result of any claim by any vendor or other person who is owed money by the Company for
services rendered or products sold or contracted for, but only to the extent necessary to ensure that such loss, liability, claim,
damage or expense does not reduce the amount of funds in the Trust Fund; provided, that such indemnity shall not apply if such
vendor or other person has executed an agreement waiving any claims against the Trust Fund.


 


(d) In the event that
the Company does not consummate a Business Combination and must liquidate and its remaining net assets are insufficient to complete
such liquidation, the undersigned agrees to advance such funds necessary to complete such liquidation and agrees not to seek repayment
for such expenses.


 


3. In the event that
the Company does not consummate a Business Combination and must liquidate and its remaining net assets are insufficient to complete
such liquidation, the undersigned agrees to advance such funds necessary to complete such liquidation and agrees not to seek recourse
for such expenses.


 


4. The undersigned will
escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into
with the undersigned and an escrow agent acceptable to the Company.


 


5. [Intentionally Omitted.]


 


6. In order to minimize
potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for
its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business,
until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any
pre-existing fiduciary and contractual obligations the undersigned might have.


 



    47


     


    

 


7. (a) The undersigned
acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders
of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has
received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be
approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an
independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated stockholders from
a financial point of view.


 


(b) The undersigned
hereby agrees and acknowledges that (i) each of the Underwriters and the Company may be irreparably injured in the event of a breach
of any of the obligations contained in this letter, (ii) monetary damages may not be an adequate remedy for such breach and (iii)
the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law
or in equity, in the event of such breach.


 


8. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept
any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business
Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company
in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the
undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying,
investigating and consummating a Business Combination.


 


9. Neither the undersigned,
any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s
fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the
undersigned originates a Business Combination.


 


10. The undersigned agrees
to be a director/officer of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation
of the Company. The undersigned’s biographical information previously furnished to the Company and the Representative is
true and accurate in all material respects, does not omit any material information with respect to the undersigned’s biography
and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities
Act of 1933. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative is true and
accurate in all material respects. The undersigned represents and warrants that:


 


		(a)	He, she or it has never had a petition under the federal bankruptcy laws or any state insolvency law been filed by or against
(i) him, her or it, or any partnership in which he or she was a general partner at or within two years before the time of filing;
or (ii) any corporation or business association of which he or she was an executive officer at or within two years before the time
of such filing;



 


		(b)	He, she or it has never had a receiver, fiscal agent or similar officer been appointed by a court for his business or property,
or any such partnership;



 



    48


     


    

 


		(c)	He, she or it has never been convicted of fraud in a civil or criminal proceeding;



 


		(d)	He, she or it has never been convicted in a criminal proceeding or named the subject of a pending criminal proceeding (excluding
traffic violations and minor offenses);



 


		(e)	He, she or it has never been the subject of any order, judgment or decree, not subsequently reversed, suspended or vacated,
of any court of competent jurisdiction, permanently or temporarily enjoining or otherwise limiting him, her or it from (i) acting
as a futures commission merchant, introducing broker, commodity trading advisor, commodity pool operator, floor broker, leverage
transaction merchant, any other person regulated by the Commodity Futures Trading Commission (“CFTC”) or an associated
person of any of the foregoing, or as an investment adviser, underwriter, broker or dealer in securities, or as an affiliated person,
director or employee of any investment company, bank, savings and loan association or insurance company, or from engaging in or
continuing any conduct or practice in connection with any such activity; or (ii) engaging in any type of business practice;
or (iii) engaging in any activity in connection with the purchase or sale of any security or commodity or in connection with
any violation of federal or state securities or federal commodities laws;



 


		(f)	He, she, or it has never been the subject of any order, judgment or decree, not subsequently reversed, suspended or vacated,
of any federal or state authority barring, suspending or otherwise limiting for more than 60 days his, her or its right to engage
in any activity described in 10(e)(i) above, or to be associated with persons engaged in any such activity;



 


		(g)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by the SEC to have violated any
federal or state securities law, where the judgment in such civil action or finding by the SEC has not been subsequently reversed,
suspended or vacated;



 


		(h)	He, she, or it has never been found by a court of competent jurisdiction in a civil action or by the CFTC to have violated
any federal commodities law, where the judgment in such civil action or finding by the CFTC has not been subsequently reversed,
suspended or vacated;



 



    49


     


    

 


		(i)	He, she, or it has never been the subject of, or a party to, any Federal, State or foreign judicial or administrative order,
judgment, decree or finding, not subsequently reversed, suspended or vacated, relating to an alleged violation of (i) any Federal,
State or foreign securities or commodities law or regulation, (ii) any law or regulation respecting financial institutions or insurance
companies including, but not limited to, a temporary or permanent injunction, order of disgorgement or restitution, civil money
penalty or temporary or permanent cease-and desist order, or removal or prohibition order or (iii) any law or regulation prohibiting
mail or wire fraud or fraud in connection with any business entity;



 


		(j)	He, she or it has never been the subject of, or party to, any sanction or order, not subsequently reversed, suspended or vacated,
or any self-regulatory organization, any registered entity, or any equivalent exchange, association, entity or organization that
has disciplinary authority over its members or persons associated with a member;



 


		(k)	He, she or it has never been convicted of any felony or misdemeanor: (i) in connection with the purchase or sale of any security;
(ii) involving the making of any false filing with the SEC; or (iii) arising out of the conduct of the business of an underwriter,
broker, dealer, municipal securities dealer, investment advisor or paid solicitor of purchasers of securities;



 


		(l)	He, she or it was never subject to a final order of a state or foreign securities commission (or an agency of officer of a
state performing like functions); a state or foreign authority that supervises or examines banks, savings associations, or credit
unions; a state or foreign insurance commission (or an agency or officer of a state performing like functions); an appropriate
federal or foreign banking agency; the CFTC; or the National Credit Union Administration that is based on a violation of any law
or regulation that prohibits fraudulent, manipulative, or deceptive conduct;



 


		(m)	He, she or it has never been subject to any order, judgment or decree of any court of competent jurisdiction, that, at the
time of the sale of the Units, restrained or enjoined him, her or it from engaging or continuing to engage in any conduct or practice:
(i) in connection with the purchase or sale of any security; (ii) involving the making of any false filing with the SEC or any
foreign regulatory agency with similar functions; or (iii) arising out of the conduct of the business of an underwriter, broker,
dealer, municipal securities dealer, investment adviser or paid solicitor of purchasers of securities;



 



    50


     


    

 


		(n)	He, she or it has never been subject to any order of the SEC or any foreign regulatory agency with similar functions that orders
him, her or it to cease and desist from committing or causing a future violation of: (i) any scienter-based anti-fraud provision
of the federal securities laws, including, but not limited to, Section 17(a)(1) of the Securities Act, Section 10(b) of the Exchange
Act and Rule 10b-5 thereunder, Section 15(c) and Section 206(1) of the Advisers Act or any other rule or regulation thereunder;
or (ii) Section 5 of the Securities Act;



 


		(o)	He, she or it has never filed (as a registrant or issuer), or been named as an underwriter in any registration statement or
Regulation A offering statement filed with the SEC that was the subject of a refusal order, stop order, or order suspending the
Regulation A exemption, or is, currently, the subject of an investigation or proceeding to determine whether a stop order or suspension
order should be issued;



 


		(p)	He, she or it has never been subject to a United States Postal Service false representation order, or is currently subject
to a temporary restraining order or preliminary injunction with respect to conduct alleged by the United States Postal Service
to constitute a scheme or device for obtaining money or property through the mail by means of false representations;



 


		(q)	He, she or it is not subject to a final order of a state securities commission (or an agency of officer of a state performing
like functions); a state authority that supervises or examines banks, savings associations, or credit unions; a state insurance
commission (or an agency or officer of a state performing like functions); an appropriate federal banking agency; the CFTC; or
the National Credit Union Administration that bars the undersigned from: (i) association with an entity regulated by such commission,
authority, agency or officer; (ii) engaging in the business of securities, insurance or banking; or (iii) engaging in savings association
or credit union activities;



 


		(r)	He, she or it is not subject to an order of the SEC entered pursuant to section 15(b) or 15B(c) of the Securities Exchange
Act of 1934 (the “Exchange Act”) or section 203(e) or 203(f) of the Investment Advisers Act of 1940 (the “Advisers
Act”) that: (i) suspends or revokes the undersigned’s registration as a broker, dealer, municipal securities dealer
or investment adviser; (ii) places limitations on the activities, functions or operations of, or imposes civil money penalties
on, such person; or (iii) bars the undersigned from being associated with any entity or from participating in the offering of any
penny stock; and



 


		(s)	He, she or it has never been suspended or expelled from membership in, or suspended or barred from association with a member
of, a securities self-regulatory organization (e.g., a registered national securities exchange or a registered national or affiliated
securities association) for any act or omission to act constituting conduct inconsistent with just and equitable principles of
trade.



 



    51


     


    

 


11. The undersigned has
full right and power, without violating any agreement by which he, she or it is bound, to enter into this letter agreement and
to serve as a Director and/or officer of the Company.


 


12. The undersigned hereby
waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the
undersigned, directly or indirectly (or to sell such shares to the Company in a tender offer), whether purchased by the undersigned
prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise
sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions
of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business
Combination.


 


13. The undersigned hereby
agrees to not propose, or vote in favor of, an amendment to the Company’s Amended and Restated Certificate of Incorporation
with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless
the Company offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.


 


14. In connection with
Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the
application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising
out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with
the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought
before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English
and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s
decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost
of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne
by the non-prevailing party or as otherwise directed by the arbitrators.


 


15. As used herein, (i)
a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement,
share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities;
(ii) “Insiders” shall mean all officers, directors and stockholders of the Company immediately prior
to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired
by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares”
shall mean the shares of Common Stock issued in the Company’s IPO; (v) [Intentionally Omitted;] (vi) “Registration
Statement” means the registration statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust
Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.


 



    52


     


    

 


16. Any notice, consent
or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall
be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile
transmission.


 


If to the Representative:


 


Chardan Capital Markets, LLC


17 State Street, Suite 1600


New York, NY 10004


Attn: George Kaufman


Facsimile: (646) 465-9039


 


with a copy (which copy shall not constitute
notice) to:


 


Ellenoff Grossman & Schole LLP 


1345 Avenue of the Americas


New York, New York 10105


Attn: Stuart Neuhauser, Esq. and Ari Edelman, Esq.


Facsimile.: (212) 370-7889


 


If to the Company:


 


Orisun Acquisition Corp.


555 Madison Avenue, Room 543


New York, NY 10022


Attn: Wei Chen, Chief Executive Officer


 


with a copy (which copy shall not constitute
notice) to:


 


Loeb & Loeb LLP


345 Park Avenue


New York, NY 10154


Attn: Giovanni Caruso, Esq.


Facsimile: (212) 504-3013


 


17. No party hereto may
assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent
of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate
to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto
and any successors and assigns thereof.


 


18. This Letter Agreement
constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate
in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may not be changed, amended,
modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument
executed by all parties hereto.


 


19. The undersigned acknowledges
and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein
in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters a representative of, or a fiduciary
with respect to, the Company, its stockholders or any creditor or vendor of the Company with respect to the subject matter hereof.


 




    53


     


    

 


	 	/s/ Wei
    Chen
	 	Wei Chen 


 


 


 


 


 



Signature Page to Insider Letter


 


 


54