Y:SY
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
- Acting
- Born
- 2000-01-22 · Seoul, South Korea
Known for
- The Game Caterers (2021) — Self
- Idol School (2017) — Self - Contestant
- Welcome to Heal Inn (2018)
- We See Winter (2019)
- Lee Mujin Service (2022) — Guest
- Fromis's Room (2017)
- fromis_9 concert ＜LOVE FROM.＞ IN JAPAN (2023)
- 프롤로그_프로미스의 방 엿보기 (2017)
- Jae Joong and Friends (2023)
- fromis_9's Summer Night (2022) — Self
- fromis_9's Autumn Night (2022) — Self
- Duckbap House (2025) — Self
- The Silence Of IDOL (2020) — Self