Picture of Lee Seo-yeon

Lee Seo-yeon

Born Jan 22, 2000 in Seoul, South Korea

Lee Seo-yeon, known professionally as Y:SY, is a South Korean singer under H1GHR Music. She is a former member of the girl group fromis_9. On November 17, 2025, she made her solo debut with the digital single 'NAKED'.

Filmography

Shows & movies
2022 Weverse Con [New Era]
2022 Weverse Con [New Era] as Seoyeon
2021
TVT Rating
Musical | 2h
fromis_9: FM_1.24
fromis_9: FM_1.24 as Seoyeon
9 seasons • 2018 • Continuing
TVT Rating
Reality | 12m
fromis_9: CHANNEL_9
fromis_9: CHANNEL_9 as Seoyeon
7 seasons • 2018 • Ended
TVT Rating
Reality | 23m
fromis_9: THE100
fromis_9: THE100 as Seoyeon
1 season • 2018 • Ended
TVT Rating
Reality | 11m
Welcome to Heal Inn
Welcome to Heal Inn as Seoyeon
2 seasons • 2018 • Ended
TVT Rating
Drama | 12m
Fromis_9 YouTube
Fromis_9 YouTube
1 season • 2017 • Ended
TVT Rating
Reality, Family, Musical | 5m
fromis_ Room
fromis_ Room as Herself
1 season • 2017 • Ended
TVT Rating
Reality | 45m
Idol School
Idol School as Seoyeon
1 season • 2017 • Ended
TVT Rating
Reality, Game Show, Musical | 1h 30m
fromis_'s Room
fromis_'s Room as Seoyeon
1 season • 2017 • Ended
TVT Rating
Reality | 47m