Exhibit A

JOINT FILING AGREEMENT

This will confirm the agreement by and among the undersigned that the Schedule 13G filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Class A ordinary shares, par value $0.0005 per share, of So-Young International Inc., is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

[Signature Page to Follow]

Dated: January 26, 2021

Youthful Acquisition L.P.
By:	Youthful GP Co. Limited, Its general partner
By:	/s/ Mark Babbe
Name:	Mark Babbe
Title:	Director of the General Partner
Youthful GP Co. Limited
By:	/s/ Mark Babbe
Name:	Mark Babbe
Title:	Director
Apax Digital L.P.
By:	Apax Digital GP Co. Limited
Its:	Investment Manager
By:	/s/ Andrew Guille
Name:	Andrew Guille
Title:	Director
By:	/s/ Mark Despres
Name:	Mark Despres
Title:	Authorised Signatory for and on behalf of Apax Partners Guernsey Limited as secretary
Apax Digital Co-Investment L.P.
By:	Apax Digital GP Co. Limited
Its:	Investment Manager
By:	/s/ Andrew Guille
Name:	Andrew Guille
Title:	Director
By:	/s/ Mark Despres
Name:	Mark Despres
Title:	Authorised Signatory for and on behalf of Apax Partners Guernsey Limited as secretary
Apax Digital GP L.P. Inc
By:	Apax Digital GP Co. Limited, Its general partner
By:	/s/ Andrew Guille
Name:	Andrew Guille
Title:	Director
Apax Digital GP Co. Limited
By:	/s/ Andrew Guille
Name:	Andrew Guille
Title:	Director

[Signature Page to Joint Filing Agreement]