Y:SY
Profile info
Known forActing
GenderFemale
Birthday22 January 2000 (26 years old)
Place of birthSeoul, South Korea
Known credits13
Biography
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.
Duckbap House
2025 · Self
Jae Joong and Friends
2023
fromis_9 concert ＜LOVE FROM.＞ IN JAPAN
2023
fromis_9's Autumn Night
2022 · Self
fromis_9's Summer Night
2022 · Self
Lee Mujin Service
2022 · Guest
The Game Caterers
2021 · Self
The Silence Of IDOL
2020 · Seoyeon
We See Winter
2019
Welcome to Heal Inn
2018
Fromis's Room
2017
프롤로그_프로미스의 방 엿보기
2017
Idol School
2017 · Self - Contestant
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