- S O O Y O U N G (수영)
- Stage Name: Lively Princess SOOYOUNG (명랑공주 수영 – myeongrang gongju Sooyoung)
Birth Name: Choi Soo-young (최수영)
- English Name: Summer Choi (썸머 최)
- Nicknames: Shik shin (God of food), NaSoo (interrupter), DJ Syoung
- Position: Supporting Vocalist/Lead dancer
Date of Birth: February 10, 1990
Zodiac Sign: Aquarius
- Bloodtype: O
- Sibling(s): 1 older sister (Choi Soo-jin)
Language: Korean (Fluent), English, Chinese (Basic), Japanese (Fluent)
- Specialty: Dance, Eloquence, Acting
- Casted: 2000 SM Open Audition | 2002 Korea-Japan Ultra Idol Duo Audition
- Training Duration: 6 Years 3 Months
- School: ChungAng University (중앙대학교) Department of Theater | graduated from Jeongshin Girl’s High school
- 2002 Japanese duo ‘Route φ‘ (with Marina Takahashi)
- 2003 CF Samsung Anycall Battle of Music (with Jewerly Park Jung-ah)
- 2004 School uniforms ‘Rocks’ model
- 2005 VJ for M.Net ‘Hello Chat’
- 2005 OST for Inuyasha ‘I Am‘ (Korean ver.)
- 2007 DJ for Melon ‘ChunJi Radio: Sungmin & Sooyoung’ (with Super Junior Sungmin)
- 2007 Sitcom KBS ‘Unstoppable Marriage‘ (as Choi Soo-young)
- 2008 OST for SBS drama Working Mom ‘Ggok‘ (with Yuri)
- 2008 Movie ‘Hello Schoolgirl! / 순정만화‘ (as Jung Da-jung)
- 2009 CF ‘Post Cereal‘ (with Sunny & Seohyun)
- 2009 Featured with The Blue ‘Feeling Only You‘ (with Tiffany)
- 2009 MC for MBC ‘Fantastic Duo’ (with Kim Jae-dong)
- 2009 CF ‘Post Cereal‘ (with Taeyeon & Tiffany)
- 2010 CF ‘Biotherm’ (with Tiffany & Yuri)
- The tallest member of SNSD.
- Prior to SNSD, Sooyoung was a part of J-pop duo ‘Route φ’ along with Marina Takahashi. The duo released three singles.
- Sooyoung is fluent in Japanese.
- She’s the third youngest of SNSD. However, despite being a ’90ers along with Yoona, Sooyoung is considered as a part of the 89 line because she was in the same grade with the six ’89ers.
- The biggest eater of SNSD, hence the nickname “Shikshin” (God of Food). However, she also doesn’t gain weight easily.
- “Sooyoung” literally means “swimming” in Korean.
- Her English name, Summer, was given by fellow member Jessica.
- Sooyoung is a devout Christian.
- Sooyoung has a great interest in fashion. She’s also considered as the most fashionable SNSD member.
- Her older sister, Choi Soojin, is a musical actress.
- Despite her tough image, Sooyoung is said to be the one who cries most easily.