Document:

Exhibit
10.2

 

THIS PROMISSORY NOTE
(“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE
HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF
UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION
IS NOT REQUIRED.

 

PROMISSORY NOTE

 

	Principal Amount: Up to $300,000	
    Dated as of July 20, 2021

    New York

	 	 

Mars Acquisition Corp., an
exempted limited liability Cayman Islands company and blank check company (the “Maker”), promises to pay to the order
of Mars Capital Holding Corporation, or its registered assigns or successors in interest (the “Payee”), or order, the
principal sum of up to Three Hundred Thousand Dollars ($300,000), or such lesser amount as shall have been advanced to Payee to Maker
and shall remain unpaid under this Note, in lawful money of the United States of America, on the terms and conditions described below.
All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by the Maker
to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note.

 

1. Principal. The principal
balance of this Note shall be payable by the Maker on the earlier of: (i) March 31, 2022 or (ii) the date on which Maker consummates
an initial public offering of its securities (the “IPO”) (such earlier date, the “Maturity Date”).
The principal balance may be prepaid at any time. Under no circumstances shall any individual, including but not limited to any officer,
director, employee or shareholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder.

 

2. Interest. No interest
shall accrue on the unpaid principal balance of this Note.

 

3. Drawdown Requests. Maker
and Payee agree that Maker may request up to an aggregate amount of Three Hundred Thousand Dollars ($300,000) for costs reasonably related
to Maker’s IPO. The principal of this Note may be drawn down from time to time prior to the Maturity Date upon written request from
Maker to Payee (each, a “Drawdown Request”). Each Drawdown Request must state the amount to be drawn down, and must
not be an amount less than Ten Thousand Dollars ($10,000) unless agreed upon by Maker and Payee. So long as no Event of Default has occurred
hereunder, Payee shall fund each Drawdown Request no later than five (5) business days after receipt of a Drawdown Request; provided,
however, that the maximum amount of drawdowns collectively under this Note is Three Hundred Thousand Dollars ($300,000). Once an amount
is drawn down under this Note, it shall not be available for future Drawdown Requests even if prepaid. No fees or similar amounts shall
be due to Payee in connection with, or as a result of, any Drawdown Request by Maker, except for costs incurred in the collection of any
sum due under this Note, including (without limitation) reasonable attorney’s fees.

 

4. Application of Payments.
All payments shall be applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including
(without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of
the unpaid principal balance of this Note.

 

5. Events of Default.
The following shall constitute an event of default (“Event of Default”):

 

(a) Failure to Make Required
Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five (5) business days of the Maturity Date.

 

(b) Voluntary Bankruptcy,
Etc. The commencement by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or
other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian,
sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for
the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action
by Maker in furtherance of any of the foregoing.

 

    	 	1	 

     

    

 

(c) Involuntary Bankruptcy,
Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary
case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee,
sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of
its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive days.

 

6. Remedies.

 

(a) Upon the occurrence of
an Event of Default specified in Section 5(a) hereof, Payee may, by written notice to Maker, declare this Note to be due immediately and
payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and
payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly waived, anything contained
herein or in the documents evidencing the same to the contrary notwithstanding.

 

(b) Upon the occurrence of
an Event of Default specified in Sections 5(b) and 5(c), the unpaid principal balance of this Note, and all other sums payable with regard
to this Note, shall automatically and immediately become due and payable, in all cases without any action on the part of Payee.

 

7. Waivers. Maker and
all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice
of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this
Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or
any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any
stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied
upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued hereon, may be sold upon any such writ in whole
or in part in any order desired by Payee.

 

8. Unconditional Liability.
Maker hereby waives all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this
Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected
in any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to
any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other
provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice
to Maker or affecting Maker’s liability hereunder. Payee acknowledges and agrees that the officers, employees, affiliates and agents
of Maker shall not have any liability under this Note.

 

9. Notices. All notices,
statements or other documents which are required or contemplated by this Note shall be made in writing and delivered: (i) personally or
sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated
in writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated
in writing by such party or (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other
electronic mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed
to have been given on the day of delivery, if delivered personally, on the business day following receipt of written confirmation, if
sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after
mailing if sent by mail.

 

10. Construction. THIS
NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

 

11. Severability. Any
provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

 

    	 	2	 

     

    

 

12. Trust Waiver. Notwithstanding
anything herein to the contrary, the Payee hereby waives any and all right, title, interest or claim of any kind (“Claim”)
in or to any distribution of or from the trust account to be established in which the proceeds of the IPO (including the deferred underwriters
discounts and commissions) and the proceeds of the sale of the warrants to be issued in a private placement to occur prior to the closing
of the IPO are to be deposited, as described in greater detail in the registration statement and prospectus to be filed with the Securities
and Exchange Commission in connection with the IPO, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for
any Claim against the trust account for any reason whatsoever.

 

13. Amendment; Waiver.
Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written consent of the Maker and the Payee.

 

14. Assignment. No assignment
or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without
the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void.

 

IN WITNESS WHEREOF,
Maker, intending to be legally bound hereby, has caused this Note to be duly executed by the undersigned as of the day and year first
above written.

 

	 	
    MARS ACQUISITION CORP.

     

	 	 	 
	 	By:	/s/ Karl Brenza
	 	 	Karl Brenza
	 	 	Chief Executive Officer

 

    	 	3Exhibit 10.3

 

Mars Acquisition
Corp.

AMENDMENT
NO. 1 TO PROMISSORY NOTE

 

THIS AMENDMENT TO
PROMISSORY NOTE (this “Amendment”) is entered into effective as of April 20, 2022, by Mars Acquisition Corp.,
an exempted limited liability Cayman Islands company and blank check company (“Maker”), and Mars Capital
Holding Corporation, a British Virgin Islands company (the “Payee,” and, together with Maker, the “Parties”).

 

RECITALS:

 

WHEREAS, on July 20 2021,
Maker executed that certain Promissory Note in the original principal amount of $300,000.00, payable to the Payee (the “Note”);
and

 

WHEREAS, the Parties desire
to amend the Note to extend the maturity date of the Note, and each Party acknowledges the mutual benefits of so amending the Note.

 

NOW, THEREFORE, in consideration
of the foregoing and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties
hereby agree as follows:

 

1. Section 1 of the Note is
hereby amended and restated in its entirety to read as follows:

 

1. Principal. The
principal balance of this Note shall be payable by the Maker on the earlier of: (i) March 31, 2023 or (ii) the date on which Maker
consummates an initial public offering of its securities (the “IPO”) (such earlier date, the “Maturity Date”).
The principal balance may be prepaid at any time. Under no circumstances shall any individual, including but not limited to any officer,
director, employee or shareholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder.

 

 

2. Except as specifically
modified and amended herein, all other terms, conditions and covenants contained in the Note shall remain in full force and effect.

 

[Signature Page Follows]

 

     

     

    

 

        IN
WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their duly authorized representatives on April 20,
2022.

 

	 	MARS ACQUISITION CORP.
	 	 	 
	 	By: 	 
	 	Name: 	Karl Brenza
	 	Title: 	Chief Executive Officer and Chief Financial Officer

 

	 	MARS CAPITAL HOLDING CORPORATION
	 	 	 
	 	By: 	 
	 	Name: 	Shanchun Huang
	 	Title: 	Director

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