Document:

EX-10.13

 Exhibit 10.13 

Power of Attorney 
 I,
Qin Wu, a Chinese citizen with Chinese Identification Card No.440102195312273247, and a holder of 37.5% of the entire registered capital in Guangzhou Cornerstone Capital Management Co., Ltd., (the “Cornerstone Capital”) (the
“My Shareholding”), hereby irrevocably authorize Guangzhou Cornerstone Corporate Consulting Co., Ltd. (the “WFOE”) to exercise the following rights relating to My Shareholding during the term of this Power of
Attorney: 
 The WFOE is hereby authorized to act on behalf of myself as my exclusive agent and attorney with respect to all matters
concerning My Shareholding, including without limitation to: 1) attend shareholders’ meetings of Cornerstone Capital; 2) exercise all the shareholder’s rights and shareholder’s voting rights I am entitled to under the laws of China
and Cornerstone Capital’s Articles of Association, including but not limited to the sale or transfer or pledge or disposition of My Shareholding in part or in whole; and 3) designate and appoint on behalf of myself the legal representative, the
executive director and/or director, supervisor, the chief executive officer and other senior management members of Cornerstone Capital. 

Without limiting the generality of the powers granted hereunder, the WFOE shall have the power and authority under this Power of Attorney to
execute the Transfer Contracts stipulated in Exclusive Option Agreement, to which I am required to be a party, on behalf of myself, and to effect the terms of the Share Pledge Agreement and Exclusive Option Agreement, both dated the date hereof, to
which I am a party. 
 All the actions associated with My Shareholding conducted by the WFOE shall be deemed as my own actions, and all the
documents related to My Shareholding executed by the WFOE shall be deemed to be executed by me. I hereby acknowledge and ratify those actions and/or documents by the WFOE. 

The WFOE is entitled to re-authorize or assign its rights related to the aforesaid matters to any
other person or entity at its own discretion and without giving prior notice to me or obtaining my consent. 
 This Power of Attorney is
coupled with an interest and shall be irrevocable and continuously valid from the date of execution of this Power of Attorney, so long as I am a shareholder of Cornerstone Capital. 

During the term of this Power of Attorney, I hereby waive all the rights associated with My Shareholding, which have been authorized to WFOE
through this Power of Attorney, and shall not exercise such rights by myself. 
 This Power of Attorney is written in Chinese and English;
in case there is any conflict between the Chinese version and the English version, the Chinese version shall prevail. 

  
 1 

Strictly Confidential 

 
			
	Qin Wu
		
	By:	 	 /s/ Qin Wu

		
	Date:	 	October 12, 2017

  

			
	Mingqi Huang
		
	Witness:	 	 /s/ Mingqi Huang

		
	Date:	 	October 12, 2017

  
 2 

Strictly ConfidentialEX-10.14

 Exhibit 10.14 

Power of Attorney 
 I,
Tao Lin, a Chinese citizen with Chinese Identification Card No.440103198411122452, and a holder of 5% of the entire registered capital in Guangzhou Cornerstone Capital Management Co., Ltd., (the “Cornerstone Capital”) (the
“My Shareholding”), hereby irrevocably authorize Guangzhou Cornerstone Corporate Consulting Co., Ltd. (the “WFOE”) to exercise the following rights relating to My Shareholding during the term of this Power of
Attorney: 
 The WFOE is hereby authorized to act on behalf of myself as my exclusive agent and attorney with respect to all matters
concerning My Shareholding, including without limitation to: 1) attend shareholders’ meetings of Cornerstone Capital; 2) exercise all the shareholder’s rights and shareholder’s voting rights I am entitled to under the laws of China
and Cornerstone Capital’s Articles of Association, including but not limited to the sale or transfer or pledge or disposition of My Shareholding in part or in whole; and 3) designate and appoint on behalf of myself the legal representative, the
executive director and/or director, supervisor, the chief executive officer and other senior management members of Cornerstone Capital. 

Without limiting the generality of the powers granted hereunder, the WFOE shall have the power and authority under this Power of Attorney to
execute the Transfer Contracts stipulated in Exclusive Option Agreement, to which I am required to be a party, on behalf of myself, and to effect the terms of the Share Pledge Agreement and Exclusive Option Agreement, both dated the date hereof, to
which I am a party. 
 All the actions associated with My Shareholding conducted by the WFOE shall be deemed as my own actions, and all the
documents related to My Shareholding executed by the WFOE shall be deemed to be executed by me. I hereby acknowledge and ratify those actions and/or documents by the WFOE. 

The WFOE is entitled to re-authorize or assign its rights related to the aforesaid matters to any
other person or entity at its own discretion and without giving prior notice to me or obtaining my consent. 
 This Power of Attorney is
coupled with an interest and shall be irrevocable and continuously valid from the date of execution of this Power of Attorney, so long as I am a shareholder of Cornerstone Capital. 

During the term of this Power of Attorney, I hereby waive all the rights associated with My Shareholding, which have been authorized to WFOE
through this Power of Attorney, and shall not exercise such rights by myself. 
 This Power of Attorney is written in Chinese and English;
in case there is any conflict between the Chinese version and the English version, the Chinese version shall prevail. 

  
 1 

Strictly Confidential 

 
			
	Tao Lin
		
	By:	 	 /s/ Tao Lin

		
	Date:	 	October 12, 2017

  

			
	Mingqi Huang
		
	Witness:	 	 /s/ Mingqi Huang

		
	Date:	 	October 12, 2017

  
 2 

Strictly ConfidentialEX-10.15

 Exhibit 10.15 

Power of Attorney 
 I,
Weifeng Luo, a Chinese citizen with Chinese Identification Card No.440103198603043011, and a holder of 10% of the entire registered capital in Guangzhou Cornerstone Capital Management Co., Ltd., (the “Cornerstone Capital”) (the
“My Shareholding”), hereby irrevocably authorize Guangzhou Cornerstone Corporate Consulting Co., Ltd. (the “WFOE”) to exercise the following rights relating to My Shareholding during the term of this Power of
Attorney: 
 The WFOE is hereby authorized to act on behalf of myself as my exclusive agent and attorney with respect to all matters
concerning My Shareholding, including without limitation to: 1) attend shareholders’ meetings of Cornerstone Capital; 2) exercise all the shareholder’s rights and shareholder’s voting rights I am entitled to under the laws of China
and Cornerstone Capital’s Articles of Association, including but not limited to the sale or transfer or pledge or disposition of My Shareholding in part or in whole; and 3) designate and appoint on behalf of myself the legal representative, the
executive director and/or director, supervisor, the chief executive officer and other senior management members of Cornerstone Capital. 

Without limiting the generality of the powers granted hereunder, the WFOE shall have the power and authority under this Power of Attorney to
execute the Transfer Contracts stipulated in Exclusive Option Agreement, to which I am required to be a party, on behalf of myself, and to effect the terms of the Share Pledge Agreement and Exclusive Option Agreement, both dated the date hereof, to
which I am a party. 
 All the actions associated with My Shareholding conducted by the WFOE shall be deemed as my own actions, and all the
documents related to My Shareholding executed by the WFOE shall be deemed to be executed by me. I hereby acknowledge and ratify those actions and/or documents by the WFOE. 

The WFOE is entitled to re-authorize or assign its rights related to the aforesaid matters to any
other person or entity at its own discretion and without giving prior notice to me or obtaining my consent. 
 This Power of Attorney is
coupled with an interest and shall be irrevocable and continuously valid from the date of execution of this Power of Attorney, so long as I am a shareholder of Cornerstone Capital. 

During the term of this Power of Attorney, I hereby waive all the rights associated with My Shareholding, which have been authorized to WFOE
through this Power of Attorney, and shall not exercise such rights by myself. 
 This Power of Attorney is written in Chinese and English;
in case there is any conflict between the Chinese version and the English version, the Chinese version shall prevail. 

  
 1 

Strictly Confidential 

 
			
	Weifeng Luo
		
	By:	 	 /s/ Weifeng Luo

		
	Date:	 	October 12, 2017

  

			
	Mingqi Huang
		
	Witness:	 	 /s/ Mingqi Huang

		
	Date:	 	October 12, 2017

  
 2 

Strictly ConfidentialEX-10.16

 Exhibit 10.16 

Power of Attorney 
 I,
Xiaohai Zhuang, a Chinese citizen with Chinese Identification Card No.440102198503043237, and a holder of 5% of the entire registered capital in Guangzhou Cornerstone Capital Management Co., Ltd., (the “Cornerstone Capital”)
(the “My Shareholding”), hereby irrevocably authorize Guangzhou Cornerstone Corporate Consulting Co., Ltd. (the “WFOE”) to exercise the following rights relating to My Shareholding during the term of this Power of
Attorney: 
 The WFOE is hereby authorized to act on behalf of myself as my exclusive agent and attorney with respect to all matters
concerning My Shareholding, including without limitation to: 1) attend shareholders’ meetings of Cornerstone Capital; 2) exercise all the shareholder’s rights and shareholder’s voting rights I am entitled to under the laws of China
and Cornerstone Capital’s Articles of Association, including but not limited to the sale or transfer or pledge or disposition of My Shareholding in part or in whole; and 3) designate and appoint on behalf of myself the legal representative, the
executive director and/or director, supervisor, the chief executive officer and other senior management members of Cornerstone Capital. 

Without limiting the generality of the powers granted hereunder, the WFOE shall have the power and authority under this Power of Attorney to
execute the Transfer Contracts stipulated in Exclusive Option Agreement, to which I am required to be a party, on behalf of myself, and to effect the terms of the Share Pledge Agreement and Exclusive Option Agreement, both dated the date hereof, to
which I am a party. 
 All the actions associated with My Shareholding conducted by the WFOE shall be deemed as my own actions, and all the
documents related to My Shareholding executed by the WFOE shall be deemed to be executed by me. I hereby acknowledge and ratify those actions and/or documents by the WFOE. 

The WFOE is entitled to re-authorize or assign its rights related to the aforesaid matters to any
other person or entity at its own discretion and without giving prior notice to me or obtaining my consent. 
 This Power of Attorney is
coupled with an interest and shall be irrevocable and continuously valid from the date of execution of this Power of Attorney, so long as I am a shareholder of Cornerstone Capital. 

During the term of this Power of Attorney, I hereby waive all the rights associated with My Shareholding, which have been authorized to WFOE
through this Power of Attorney, and shall not exercise such rights by myself. 
 This Power of Attorney is written in Chinese and English;
in case there is any conflict between the Chinese version and the English version, the Chinese version shall prevail. 

  
 1 

Strictly Confidential 

 
			
	Xiaohai Zhuang
		
	By:	 	 /s/ Xiaohai Zhuang

		
	Date:	 	October 12, 2017

  

			
	Mingqi Huang
		
	Witness:	 	 /s/ Mingqi Huang

		
	Date:	 	October 12, 2017

  
 2 

Strictly Confidential

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