EX-4.21



 Exhibit 4.21 

Exclusive Option Agreement 

This Exclusive Option Agreement (this “Agreement”) is executed by and among the following Parties as of April 20, 2015 in Beijing,
the People’s Republic of China (“China” or the “PRC”): 
  

			
		
	 Party A:
		Shanghai Techuang Advertising Co., Ltd., a wholly foreign owned enterprise, organized and existing under the laws of the PRC, with its address at Room C2-215, Building 4, No. 218, Yesheng Road, China (Shanghai) Pilot Free
Trade Zone;
		
	 Party B:
		Bin LI, a Chinese citizen with Identification No.:             ; and
		
	 Party C:
		Beijing Yixin Information Technology Co., Ltd., a limited liability company organized and existing under the laws of the PRC, with its address at Room 754 and 755, Floor 7, Building 3, No.6, Capital Gymnasium South Road,
Haidian District, Beijing.

 In this Agreement, each of Party A, Party B and Party C shall be referred to as a “Party”
respectively, and they shall be collectively referred to as the “Parties”. 
 Whereas: 

Party B is a shareholder of Party C and as of the date hereof holds 55.7% of equity interests of Party C, representing RMB 27,850,000 in the
registered capital of Party C. 
 Now therefore, upon mutual discussion and negotiation, the Parties have reached the following agreement:

  

	1.	Sale and Purchase of Equity Interest 

  

	 	1.1	Option Granted 

 In consideration of the payment of RMB10 by Party A, the receipt and
adequacy of which is hereby acknowledged by Party B, Party B hereby irrevocably grants Party A an irrevocable and exclusive right to purchase, or designate one or more persons (each, a “Designee”) to purchase the equity interests in Party
C then held by Party B once or at multiple times at any time in part or in whole at Party A’s sole and absolute discretion to the extent permitted by Chinese laws and at the price described in Section 1.3 herein (such right being the
“Equity Interest Purchase Option”). Except for Party A and the Designee(s), no other person shall be entitled to the Equity Interest Purchase Option or other rights with respect to the equity interests of Party B. Party C hereby agrees to
the grant by Party B of the Equity Interest Purchase Option to Party A. The term “person” as used herein shall refer to individuals, corporations, partnerships, partners, enterprises, trusts or non-corporate organizations. 

  
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	 	1.2	Steps for Exercise of Equity Interest Purchase Option 

 Subject to the provisions of the
laws and regulations of China, Party A may exercise the Equity Interest Purchase Option by issuing a written notice to Party B (the “Equity Interest Purchase Option Notice”), specifying: (a) Party A’s or the Designee’s
decision to exercise the Equity Interest Purchase Option; (b) the portion of equity interests to be purchased by Party A or the Designee from Party B (the “Optioned Interests”); and (c) the date for purchasing the Optioned
Interests or the date for transfer of the Optioned Interests. 
  

	 	1.3	Equity Interest Purchase Price 

 The purchase price of the Optioned Interests shall be
RMB 27,850,000. If appraisal is required by the laws of China at the time when Party A exercises the Equity Interest Purchase Option, the Parties shall negotiate in good faith and based on the appraisal result make necessary adjustment to the
Equity Interest Purchase Price so that it complies with any and all then applicable laws of China (collectively, the “Equity Interest Purchase Price”). Party B shall donate the balance of the Equity Interest Purchase Price received from
Party A, after deducting/ withholding the relevant taxes (if any) pursuant to applicable laws of China, to Party A or the Designee(s) of Party A for free within ten(10) days after Party B receives the Equity Interest Purchase Price and pays/
withholds the relevant taxes (if any). 
  

	 	1.4	Transfer of Optioned Interests 

 For each exercise of the Equity Interest Purchase
Option: 
  

	 	1.4.1	Party B shall cause Party C to promptly convene a shareholders’ meeting, at which a resolution shall be adopted approving Party B’s transfer of the Optioned Interests to Party A and/or the Designee(s);


  

	 	1.4.2	Party B shall obtain written statements from the other shareholders of Party C giving consent to the transfer of the equity interest to Party A and/or the Designee(s) and waiving any right of first refusal related
thereto; 

  

	 	1.4.3	Within thirty (30) days after receipt of the Equity Interest Purchase Option Notice by Party B from Party A and/or any Designee (whichever is applicable), Party B and Party A and/or such Designee (whichever is
applicable) shall complete all procedures for Party A’s and/or such Designee’s (whichever is applicable) acquisition of such Optioned Interests and for Party A and/or such Designee (whichever is applicable) becoming a shareholder of Party
C, including without limitation execution of an equity interest transfer contract and any other necessary documents or agreements, adoption of any necessary resolutions, issuance of any necessary documents by Party C and performance of all relevant
procedures; 


  
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	 	1.4.4	The relevant Parties shall execute all other necessary contracts, agreements or documents, obtain all necessary government licenses and permits and take all necessary actions to transfer valid ownership of the Optioned
Interests to Party A and/or the Designee(s), unencumbered by any security interests, and cause Party A and/or the Designee(s) to become the registered owner(s) of the Optioned Interests. For the purpose of this Section and this Agreement,
“security interests” shall include securities, mortgages, third party’s rights or interests, any stock options, acquisition right, right of first refusal, right to offset, ownership retention or other security arrangements, but shall
be deemed to exclude any security interest created by this Agreement, Party B’s Equity Interest Pledge Agreement and Party B’s Power of Attorney. “Party B’s Equity Interest Pledge Agreement” as used in this Agreement shall
refer to the Interest Pledge Agreement executed by and among Party A, Party B and Party C on the date hereof and any modification, amendment and restatement thereto. “Party B’s Power of Attorney” as used in this Agreement shall refer
to the Power of Attorney executed by Party B on the date hereof granting Party A with power of attorney and any modification, amendment and restatement thereto. 

  


	2.	Covenants 

  

	 	2.1	Covenants regarding Party C 

 Party B (as a shareholder of Party C) and Party C hereby
covenant as follows: 
  

	 	2.1.1	Without the prior written consent of Party A, they shall not in any manner supplement, change or amend the articles of association of Party C, increase or decrease its registered capital, or change its structure of
registered capital in other manners; 

  

	 	2.1.2	They shall maintain Party C’s corporate existence in accordance with good financial and business standards and practices, obtain and maintain all necessary government licenses and permits by prudently and
effectively operating its business and handling its affairs; 

  

	 	2.1.3	Without the prior written consent of Party A, they shall not at any time following the date hereof, sell, transfer, mortgage or dispose of in any manner any material assets of Party C or legal or beneficial interest in
the material business or revenues of Party C of more than RMB 200,000, or allow the encumbrance thereon of any security interest; 

  

	 	2.1.4	Without the prior written consent of Party A, they shall not incur, inherit, guarantee or suffer the existence of any debt, except for payables incurred in the ordinary course of business other than through loans;



  
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	 	2.1.5	They shall always operate all of Party C’s businesses in the ordinary course of business to maintain the asset value of Party C and refrain from any action/omission that may affect Party C’s operating status
and asset value; 

  

	 	2.1.6	Without the prior written consent of Party A, they shall not cause Party C to execute any major contract, except the contracts in the ordinary course of business (for purpose of this subsection, a contract with a price
exceeding RMB50,000 shall be deemed a major contract); 

  

	 	2.1.7	Without the prior written consent of Party A, they shall not cause Party C to provide any person with any loan or credit; 

  

	 	2.1.8	They shall provide Party A with information on Party C’s business operations and financial condition at Party A’s request; 


 

	 	2.1.9	If requested by Party A, they shall procure and maintain insurance in respect of Party C’s assets and business from an insurance carrier acceptable to Party A, at an amount and type of coverage typical for
companies that operate similar businesses; 

  

	 	2.1.10	Without the prior written consent of Party A, they shall not cause or permit Party C to merge, consolidate with, acquire or invest in any person; 


 

	 	2.1.11	They shall immediately notify Party A of the occurrence or possible occurrence of any litigation, arbitration or administrative proceedings relating to Party C’s assets, business or revenue; 


 

	 	2.1.12	To maintain the ownership by Party C of all of its assets, they shall execute all necessary or appropriate documents, take all necessary or appropriate actions, file all necessary or appropriate complaints, and raise
necessary or appropriate defenses against all claims; 

  

	 	2.1.13	Without the prior written consent of Party A, they shall ensure that Party C shall not in any manner distribute dividends to its shareholders, provided that upon Party A’s written request, Party C shall immediately
distribute all distributable profits to its shareholders; 

  

	 	2.1.14	At the request of Party A, they shall appoint any person designated by Party A as the director or executive director of Party C; 

  

	 	2.1.15	Without Party A’s prior written consent, Party C they shall not engage in any business in competition with Party A or its affiliates; and 


  
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	 	2.1.16	Unless otherwise required by PRC law, Party C shall not be dissolved or liquated without prior written consent by Party A. 

  

	 	2.2	Covenants of Party B 

 Party B hereby covenants as follows: 

 

	 	2.2.1	Without the prior written consent of Party A, Party B shall not sell, transfer, mortgage or dispose of in any other manner any legal or beneficial interest in the equity interests in Party C held by Party B, or allow
the encumbrance thereon, except for the interest placed in accordance with Equity Interest Pledge Agreement entered into by and among the Party A and Party B on April 20, 2015(the “Equity Interest Pledge Agreement”) and Power of
Attorney provided by Party B to Party A on April 20, 2015 (the “Power of Attorney”); 

  

	 	2.2.2	Without the prior written consent of Party A, Party B shall cause the shareholders’ meeting and/or the directors (or the executive director) of Party C not to approve any sale, transfer, mortgage or disposition in
any other manner of any legal or beneficial interest in the equity interests in Party C held by Party B, or allow the encumbrance thereon of any security interest, except for the interest placed in accordance with Equity Interest Pledge Agreement
and Power of Attorney; 

  

	 	2.2.3	Without the prior written consent of Party A, Party B shall cause the shareholders’ meeting or the directors (or the executive director) of Party C not to approve the merger or consolidation with any person, or the
acquisition of or investment in any person; 

  

	 	2.2.4	Party B shall immediately notify Party A of the occurrence or possible occurrence of any litigation, arbitration or administrative proceedings relating to the equity interests in Party C held by Party B;


  

	 	2.2.5	Party B shall cause the shareholders’ meeting or the directors (or the executive director) of Party C to vote their approval of the transfer of the Optioned Interests as set forth in this Agreement and to take any
and all other actions that may be requested by Party A; 

  

	 	2.2.6	To the extent necessary to maintain Party B’s ownership in Party C, Party B shall execute all necessary or appropriate documents, take all necessary or appropriate actions, file all necessary or appropriate
complaints, and raise necessary or appropriate defenses against all claims; 

  

	 	2.2.7	Party B shall appoint any designee of Party A as the director or the executive director of Party C, at the request of Party A; 


  
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	 	2.2.8	Party B hereby waives its right of first of refusal to transfer of equity interest by any other shareholder of Party C to Party A (if any), and gives consent to execution by each other shareholder of Party C with Party
A and Party C the exclusive option agreement, the equity interest pledge agreement and the power of attorney similar to this Agreement, Party B’s Equity Interest Pledge Agreement and Party B’s Power of Attorney and undertakes not to take
any action in conflict with such documents executed by the other shareholders; 

  

	 	2.2.9	Party B shall promptly donate any profit, interest, dividend or proceeds of liquidation to Party A or any other person designated by Party A to the extent permitted under applicable PRC laws; and 


 

	 	2.2.10	Party B shall strictly abide by the provisions of this Agreement and other contracts jointly or separately executed by and among Party B, Party C and Party A, perform the obligations hereunder and thereunder, and
refrain from any action/omission that may affect the effectiveness and enforceability thereof. To the extent that Party B has any remaining rights with respect to the equity interests subject to this Agreement hereunder or under the Party B’s
Equity Interest Pledge Agreement or under the Party B’s Power of Attorney, Party B shall not exercise such rights except in accordance with the written instructions of Party A. 


 

	3.	Representations and Warranties 

 Party B and Party C hereby represent and warrant
to Party A, jointly and severally, as of the date of this Agreement and each date of transfer of the Optioned Interests, that: 
  

	 	3.1	They have the power, capacity and authority to execute and deliver this Agreement and any equity interest transfer contracts to which they are parties concerning the Optioned Interests to be transferred thereunder
(each, a “Transfer Contract”), and to perform their obligations under this Agreement and any Transfer Contracts. Party B and Party C agree to enter into Transfer Contracts consistent with the terms of this Agreement upon Party A’s
exercise of the Equity Interest Purchase Option. This Agreement and the Transfer Contracts to which they are parties constitute or will constitute their legal, valid and binding obligations and shall be enforceable against them in accordance with
the provisions thereof; 

  

	 	3.2	Party B and Party C have obtained any and all approvals and consents from government authorities and third parties (if required) for execution, delivery and performance of this Agreement. 


 

	 	3.3	The execution and delivery of this Agreement or any Transfer Contracts and the obligations under this Agreement or any Transfer Contracts shall not: (i) cause any violation of any applicable laws of China;
(ii) be inconsistent with the articles of association, bylaws or other organizational documents of Party C; (iii) cause the violation of any contracts or instruments to which they are a party or which are binding on them, or constitute any
breach under any contracts or instruments to which they are a party or which are binding on them; (iv) cause any violation of any condition for the grant and/or continued effectiveness of any licenses or permits issued to either of them; or
(v) cause the suspension or revocation of or imposition of additional conditions to any licenses or permits issued to either of them; 


  
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	 	3.4	Party B has a good and merchantable title to the equity interests held by Party B in Party C. Except for Equity Interest Pledge Agreement and Power of Attorney, Party B has not placed any security interest on such
equity interests; 

  

	 	3.5	Party C is a limited liability company duly organized and validly existing under the laws of the PRC. Party C has a good and merchantable title to all of its assets, and has not placed any security interest on the
aforementioned assets; 

  

	 	3.6	Party C does not have any outstanding debts, except for (i) debt incurred in the ordinary course of business; and (ii) debts disclosed to Party A for which Party A’s written consent has been obtained.


  

	 	3.7	Party C has complied with all laws and regulations of China applicable to asset acquisitions; and 

  

	 	3.8	There are no pending or threatened litigation, arbitration or administrative proceedings relating to the equity interests in Party C, assets of Party C or Party C. 


 

	4.	Effective Date and Term 

 This Agreement shall become effective upon execution by
the Parties, and remain effective until all equity interests held by Party B in Party C have been transferred or assigned to Party A and/or any other person designated by Party A in accordance with this Agreement. 

 

	5.	Governing Law and Resolution of Disputes 

  

	 	5.1	Governing law 

 The execution, effectiveness, construction, performance, amendment and
termination of this Agreement and the resolution of disputes hereunder shall be governed by the laws of PRC. 
  

	 	5.2	Methods of Resolution of Disputes 

 In the event of any dispute with respect to the
construction and performance of this Agreement, the Parties shall first resolve the dispute through friendly negotiations. In the event the Parties fail to reach an agreement on the dispute within 30 days after either Party’s request to the
other Parties for resolution of the dispute through negotiations, either Party may submit the relevant dispute to the China International Economic and Trade Arbitration Commission for arbitration, in accordance with its arbitration rules. The
arbitration shall be conducted in Beijing. The arbitration award shall be final and binding on all Parties. 

  
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	6.	Taxes and Fees 

 Unless as otherwise agreed in this Agreement, each Party shall
pay any and all transfer and registration tax, expenses and fees incurred thereby or levied thereon in accordance with the laws of China in connection with the preparation and execution of this Agreement and the Transfer Contracts, as well as the
consummation of the transactions contemplated under this Agreement and the Transfer Contracts. 
  

	7.	Notices 

  

	 	7.1	All notices and other communications required or permitted to be given pursuant to this Agreement shall be delivered personally or sent by registered mail, postage prepaid, by a commercial courier service or by
facsimile transmission to the address of such Party set forth below. A confirmation copy of each notice shall also be sent by email. The dates on which notices shall be deemed to have been effectively given shall be determined as follows:


  

	 	7.1.1	Notices given by personal delivery, by courier service or by registered mail, postage prepaid, shall be deemed effectively given on the date of receipt or refusal at the address specified for notices; 


 

	 	7.1.2	Notices given by facsimile transmission shall be deemed effectively given on the date of successful transmission (as evidenced by an automatically generated confirmation of transmission). 


 

	 	7.2	For the purpose of notices, the addresses of the Parties are as follows: 

  

			
	Party A:		Shanghai Techuang Advertising Co., Ltd.
	Address:		Room651, Floor 6, New Century Hotel Office, No.6 , Capital Gymnasium South Road, Haidian District, Beijing
	Attn:		Bin Li
	Phone:		+8610 6849 2345
		
	Party B:		Bin LI
	Address:		Room 651, Floor 6, New Century Hotel Office, No.6 , Capital Gymnasium South Road, Haidian District, Beijing
	Phone:		+86 139 0118 3488
		
	Party C:		Beijing Yixin Information Technology Co., Ltd.
	Address:		Room 651, Floor 6, New Century Hotel Office, No.6, Capital Gymnasium South Road, Haidian District, Beijing
	Attn:		Bin Li
	Phone:		+8610 6849 2345


  
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	 	7.3	Any Party may at any time change its address for notices by a notice delivered to the other Parties in accordance with the terms hereof. 


 

	8.	Confidentiality 

 The Parties acknowledge that the existence and the terms of this
Agreement, and any oral or written information exchanged between the Parties in connection with the preparation and performance this Agreement are regarded as confidential information. Each Party shall maintain confidentiality of all such
confidential information, and without obtaining the written consent of other Parties, it shall not disclose any relevant confidential information to any third parties, except for the information that: (a) is or will be in the public domain
(other than through the receiving Party’s unauthorized disclosure); (b) is under the obligation to be disclosed pursuant to the applicable laws or regulations, rules of any stock exchange, or orders of the court or other government
authorities; or (c) is required to be disclosed by any Party to its shareholders, directors, employees, legal counsels or financial advisors regarding the transaction contemplated hereunder, provided that such shareholders, directors,
employees, legal counsels or financial advisors shall be bound by the confidentiality obligations similar to those set forth in this Section. Disclosure of any confidential information by the shareholders, director, employees of or agencies engaged
by any Party shall be deemed disclosure of such confidential information by such Party and such Party shall be held liable for breach of this Agreement. 
  

	9.	Further Warranties 

 The Parties agree to promptly execute documents that are
reasonably required for or are conducive to the implementation of the provisions and purposes of this Agreement and take further actions that are reasonably required for or are conducive to the implementation of the provisions and purposes of this
Agreement. 
  

	10.	Breach of Agreement 

  

	 	10.1	If Party B or Party C conducts any material breach of any term of this Agreement, Party A shall have right to terminate this Agreement and/or require the Party B or Party C to compensate all damages; this
Section 10 shall not prejudice any other rights of Party A herein; 

  

	 	10.2	Party B or Party C shall not have any right to terminate this Agreement in any event unless otherwise required by applicable laws. 

  


	11.	Miscellaneous 

  

	 	11.1	Amendment, change and supplement 

 Any amendment, change and supplement to this
Agreement shall require the execution of a written agreement by all of the Parties. 

  
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	 	11.2	Entire agreement 

 Except for the amendments, supplements or changes in writing executed
after the execution of this Agreement, this Agreement shall constitute the entire agreement reached by and among the Parties hereto with respect to the subject matter hereof, and shall supercede all prior oral and written consultations,
representations and contracts reached with respect to the subject matter of this Agreement. 
  

	 	11.3	Headings 

 The headings of this Agreement are for convenience only, and shall not be
used to interpret, explain or otherwise affect the meanings of the provisions of this Agreement. 
  

	 	11.4	Language 

 This Agreement is written in both Chinese and English language in three
copies, each Party having one copy. In case there is any conflict between the Chinese version and the English version, the Chinese version shall prevail. 
  

	 	11.5	Severability 

 In the event that one or several of the provisions of this Agreement are
found to be invalid, illegal or unenforceable in any aspect in accordance with any laws or regulations, the validity, legality or enforceability of the remaining provisions of this Agreement shall not be affected or compromised in any respect. The
Parties shall strive in good faith to replace such invalid, illegal or unenforceable provisions with effective provisions that accomplish to the greatest extent permitted by law and the intentions of the Parties, and the economic effect of such
effective provisions shall be as close as possible to the economic effect of those invalid, illegal or unenforceable provisions. 
  

	 	11.6	Successors 

 This Agreement shall be binding on and shall inure to the interest of the
respective successors of the Parties and the permitted assigns of such Parties. 
  

	 	11.7	Survival 

 11.7.1 Any obligations that occur or that are due as a result of this
Agreement upon the expiration or early termination of this Agreement shall survive the expiration or early termination thereof. 

  
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	 	11.7.2	The provisions of Sections 5, 8, 10 and this Section 11.7 shall survive the termination of this Agreement. 

  

	 	11.8	Waivers 

 Any Party may waive the terms and conditions of this Agreement, provided that
such a waiver must be provided in writing and shall require the signatures of the Parties. No waiver by any Party in certain circumstances with respect to a breach by other Parties shall operate as a waiver by such a Party with respect to any
similar breach in other circumstances. 

  
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 IN WITNESS WHEREOF, the Parties have caused their authorized representatives to execute this
Exclusive Option Agreement as of the date first above written. 
 Party A: Shanghai Techuang Advertising Co., Ltd. (seal) 

 

			
	By:		 /s/ Bin Li

	Name:		Bin Li
	Title:		Legal Representative








 IN WITNESS WHEREOF, the Parties have caused their authorized representatives to execute this Exclusive Option
Agreement as of the date first above written. 
  

			
	Party B: Bin LI
		
	By:		 /s/ Bin Li









 IN WITNESS WHEREOF, the Parties have caused their authorized representatives to execute this Exclusive Option
Agreement as of the date first above written. 
 Party C: Beijing Yixin Information Technology Co., Ltd. (Seal) 

 

			
	By:		 /s/ Bin Li

	Name:		Bin LI
	Title:		Legal Representative








 Schedule A 

The following schedule sets forth all other similar agreements the registrant entered into with the relevant Chinese structured entity of the registrant.
Other than the information set forth below, there is no material difference between such other agreements and this exhibit. 
  

					
	 VIE
	  	 Execution Parties
	  	Execution Date
	Beijing Yixin Information Technology Co., Ltd.	  	 Party A: Shanghai Techuang
 Advertising Co.,
Ltd.
 Party B: Shenzhen Tencent
 Industry Investment Fund Co.,
Ltd.
 Party C: Beijing Yixin Information Technology Co., Ltd.
	  	April 20, 2015
	Beijing Yixin Information Technology Co., Ltd.	  	 Party A: Shanghai Techuang
 Advertising Co.,
Ltd.
 Party B: Beijing Jiasheng
 Investment Management Co.,
Ltd.
 Party C: Beijing Yixin Information Technology Co., Ltd.
	  	April 20, 2015