Y:SY
January 22, 2000 (26 years old) in Seoul, South Korea
Lee Seo-yeon, known professionally as Y:SY, is a South Korean singer-songwriter and rapper under H1GHR Music. She is a former member of the girl group fromis_9, formed through the reality survival show Idol School (2017). She left the group in 2024. She made her solo debut on November 17, 2025, with the digital single Naked.
Known For
Credits
- 2025 · Duckbap House as Self
- 2023 · Jae Joong and Friends as
- 2023 · fromis_9 concert ＜LOVE FROM.＞ IN JAPAN as
- 2022 · fromis_9's Autumn Night as Self
- 2022 · fromis_9's Summer Night as Self
- 2022 · Lee Mujin Service as Guest
- 2021 · The Game Caterers as Self
- 2020 · The Silence Of IDOL as Seoyeon
- 2019 · We See Winter as
- 2018 · Welcome to Heal Inn as
- 2017 · Fromis's Room as
- 2017 · 프롤로그_프로미스의 방 엿보기 as
- 2017 · Idol School as Self - Contestant