She was a former individual contestant on the first season of Produce 101. Her final rank was #30.
Sometime after Produce 101, she appeared in a commercial film for NCT's SK Telecom. Through her social media accounts, she announced on November 30, 2016 that she was auditioning for Kiwi Pop.
Two years later, Seokyoung was then revealed as an upcoming member of GWSN on June 22, 2018 with a reveal teaser video followed by a photo. She made her official debut with the girl group on September 5, 2018 with their debut mini album, THE PARK IN THE NIGHT part one.
- GOT YA! GWSN (Mnet, 2018)
- Prior to joining Produce 101, she was a trainee for 2 years.
- On Produce 101, she got the nickname 'Sun Seokyoung' (해님서경) for her bright personality.
- Her hobbies are solving math problems, dance covers, enacting scripts and beauty styling, while her specialty is K-pop dance and Japanese.
- She is a fan of Jessica.
- Prior to debuting with GWSN, her Instagram handles were _990416 and sk_990416. She also had a Facebook account. Currently, she no longer has any public social media accounts.
- She is the shortest member in GWSN.
- She went to a center for gifted students.
- Her childhood dream was to become a dancer.
- ↑ 1.0 1.1 1.2 1.3 1.4 Produce 101 profile
- ↑ Produce 101: Episode #11
- ↑ NCT SK Telecom CF / Kim Seokyoung @ 0:53
- ↑ GWSN seventh member Seokyoung reveal video
- ↑ GWSN seventh member Seokyoung reveal photo
- ↑ GWSN's debut date
- ↑ 
- ↑ 8.0 8.1 Seokyung's IG post for Jessica's birthday
- ↑ 9.0 9.1 YouTube: GWSN interview and self-introduction with On the Rise at Pops in Seoul (Arirang TV)
- ↑ THE PARK IN THE NIGHT part two album photobook