UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.     )*

So-Young International Inc.

(Name of Issuer)

Class A ordinary shares, par value $0.0005 per share

(Title of Class of Securities)

83356Q108**

(CUSIP Number)

December 31, 2019

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

** This CUSIP applies to the American Depositary Shares (“ADSs”), evidenced by American Depositary Receipts. Thirteen ADSs represent ten Class A ordinary shares of the Issuer.

The information required in the remainder of this cover page shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 83356Q108 13G Page 2 of 13 Pages

1.	Name of reporting persons:   Youthful Acquisition L.P.
2.	Check the appropriate box if a member of a group (see instructions)   (a)  ☐        (b)  ☒
3.	SEC use only
4.	Citizenship or place of organization:   Guernsey

Number of shares   beneficially   owned by each reporting person with	5.	Sole voting power:   0
	6.	Shared voting power:   5,937,776
	7.	Sole dispositive power:   0
	8.	Shared dispositive power:   5,937,776

9.	Aggregate amount beneficially owned by each reporting person:   5,937,776
10.	Check box if the aggregate amount in Row (9) excludes certain shares (see instructions)   ☐
11.	Percent of class represented by amount in Row (9):   8.6%1
12.	Type of reporting person (see instructions):   PN

1 The calculation of the foregoing percentage is based on 69,371,718 Class A ordinary shares of the Company outstanding as of December 31, 2019, as reported in the Company’s Form 6-K filed on March 23, 2020.

CUSIP No. 83356Q108 13G Page 3 of 13 Pages

1.	Name of reporting persons:   Apax Digital L.P.
2.	Check the appropriate box if a member of a group (see instructions)   (a)  ☐        (b)  ☒
3.	SEC use only
4.	Citizenship or place of organization:   Guernsey

Number of shares   beneficially   owned by each reporting person with	5.	Sole voting power:   0
	6.	Shared voting power:   5,937,776
	7.	Sole dispositive power:   0
	8.	Shared dispositive power:   5,937,776

9.	Aggregate amount beneficially owned by each reporting person:   5,937,776
10.	Check box if the aggregate amount in Row (9) excludes certain shares (see instructions)   ☐
11.	Percent of class represented by amount in Row (9):   8.6%2
12.	Type of reporting person (see instructions):   PN

2 The calculation of the foregoing percentage is based on 69,371,718 Class A ordinary shares of the Company outstanding as of December 31, 2019, as reported in the Company’s Form 6-K filed on March 23, 2020.

CUSIP No. 83356Q108 13G Page 4 of 13 Pages

1.	Name of reporting persons:   Apax Digital Co-Investment L.P.
2.	Check the appropriate box if a member of a group (see instructions)   (a)  ☐        (b)  ☒
3.	SEC use only
4.	Citizenship or place of organization:   Guernsey

Number of shares   beneficially   owned by each reporting person with	5.	Sole voting power:   0
	6.	Shared voting power:   5,937,776
	7.	Sole dispositive power:   0
	8.	Shared dispositive power:   5,937,776

9.	Aggregate amount beneficially owned by each reporting person:   5,937,776
10.	Check box if the aggregate amount in Row (9) excludes certain shares (see instructions)   ☐
11.	Percent of class represented by amount in Row (9):   8.6%3
12.	Type of reporting person (see instructions):   PN

3 The calculation of the foregoing percentage is based on 69,371,718 Class A ordinary shares of the Company outstanding as of December 31, 2019, as reported in the Company’s Form 6-K filed on March 23, 2020.

CUSIP No. 83356Q108 13G Page 5 of 13 Pages

1.	Name of reporting persons:   Apax Digital GP L.P. Inc
2.	Check the appropriate box if a member of a group (see instructions)   (a)  ☐        (b)  ☒
3.	SEC use only
4.	Citizenship or place of organization:   Guernsey

Number of shares   beneficially   owned by each reporting person with	5.	Sole voting power:   0
	6.	Shared voting power:   5,937,776
	7.	Sole dispositive power:   0
	8.	Shared dispositive power:   5,937,776

9.	Aggregate amount beneficially owned by each reporting person:   5,937,776
10.	Check box if the aggregate amount in Row (9) excludes certain shares (see instructions)   ☐
11.	Percent of class represented by amount in Row (9):   8.6%4
12.	Type of reporting person (see instructions):   PN

4 The calculation of the foregoing percentage is based on 69,371,718 Class A ordinary shares of the Company outstanding as of December 31, 2019, as reported in the Company’s Form 6-K filed on March 23, 2020.

CUSIP No. 83356Q108 13G Page 6 of 13 Pages

1.	Name of reporting persons:   Apax Digital GP Co. Limited
2.	Check the appropriate box if a member of a group (see instructions)   (a)  ☐        (b)  ☒
3.	SEC use only
4.	Citizenship or place of organization:   Guernsey

Number of shares   beneficially   owned by each reporting person with	5.	Sole voting power:   0
	6.	Shared voting power:   5,937,776
	7.	Sole dispositive power:   0
	8.	Shared dispositive power:   5,937,776

9.	Aggregate amount beneficially owned by each reporting person:   5,937,776
10.	Check box if the aggregate amount in Row (9) excludes certain shares (see instructions)   ☐
11.	Percent of class represented by amount in Row (9):   8.6%5
12.	Type of reporting person (see instructions):   OO

5 The calculation of the foregoing percentage is based on 69,371,718 Class A ordinary shares of the Company outstanding as of December 31, 2019, as reported in the Company’s Form 6-K filed on March 23, 2020.

Item 1.

(a). Name of Issuer

So-Young International Inc. (the “Company”)

(b). Address of Issuer’s Principal Executive Offices:

3/F, Wangjing Soho-Tower 3A, Chaoyang District Beijing 100102, People’s Republic of China

Item 2(a). Name of Person Filing

Item 2(b). Address of Principal Business Office

Item 2(c). Citizenship

YOUTHFUL ACQUISITION L.P.

P.O. BOX 656

EAST WING, TRAFALGAR COURT, LES BANQUES

ST. PETER PORT, GUERNSEY GY1 3PP

PLACE OF ORGANIZATION: GUERNSEY

APAX DIGITAL L.P.

3/F, ROYAL BANK PLACE

1 GLATEGNY ESPLANADE

ST. PETER PORT, GUERNSEY GY1 2HJ

PLACE OF ORGANIZATION: GUERNSEY

APAX DIGITAL CO-INVESTMENT L.P.

3/F, ROYAL BANK PLACE

1 GLATEGNY ESPLANADE

ST. PETER PORT, GUERNSEY GY1 2HJ

PLACE OF ORGANIZATION: GUERNSEY

APAX DIGITAL GP L.P. INC

3/F, ROYAL BANK PLACE

1 GLATEGNY ESPLANADE

ST. PETER PORT, GUERNSEY GY1 2HJ

PLACE OF ORGANIZATION: GUERNSEY

APAX DIGITAL GP CO. LIMITED

3/F, ROYAL BANK PLACE

1 GLATEGNY ESPLANADE

ST. PETER PORT, GUERNSEY GY1 2HJ

PLACE OF ORGANIZATION: GUERNSEY

The foregoing persons are hereinafter sometimes collectively referred to as the “Reporting Persons.” Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party.

The Class A Shares (as defined below) reported herein are held by Youthful Acquisition L.P. Youthful Acquisition L.P. is majority beneficially owned by Apax Digital L.P. and Apax Digital Co-Investment L.P. Apax Digital GP L.P. Inc is the general partner of each of Apax Digital L.P. and Apax Digital Co-Investment L.P. Apax Digital GP Co. Limited is the general partner of Apax Digital GP L.P. Inc.

Item 2(d). Title of Class of Securities:

Class A ordinary shares, par value $0.0005 per share (“Class A Shares”)

Item 2(e). CUSIP Number:

83356Q108

Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or (c), check whether the person filing is a:

Not applicable.

Item 4. Ownership.

(a) Amount beneficially owned:

As of the date hereof each of the Reporting Persons may be deemed to be the beneficial owner of the 5,937,776 Class A Shares held by Youthful Acquisition L.P.

(b) Percent of class:

See Item 11 of each cover page.

(c) Number of shares as to which such person has:

(i) Sole power to vote or to direct the vote

See Item 5 of each cover page.

(ii) Shared power to vote or to direct the vote

See Item 6 of each cover page.

(iii) Sole power to dispose or to direct the disposition of

See Item 7 of each cover page.

(iv) Shared power to dispose or to direct the disposition of

See Item 8 of each cover page.

Item 5. Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following  ☐.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.

Not applicable.

Item 8. Identification and Classification of Members of the Group.

Not applicable.

Item 9. Notice of Dissolution of Group.

Not applicable.

Item 10. Certification.

Not applicable.

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

DATED: April 21, 2020

Youthful Acquisition L.P.
By:	Youthful GP Co. Limited,
	Its general partner
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/ Trina Le Noury
Name:	Trina Le Noury
Title:	Director
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/ Trina Le Noury
Name:	Trina Le Noury
Title:	Director

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/ Trina Le Noury
Name:	Trina Le Noury
Title:	Director

EXHIBIT LIST

Exhibit A Joint Filing Agreement, dated as of April 21, 2020, by and among the Reporting Persons.