Known For
Acting
Born
Jan 22, 2000
Place of Birth
Seoul, South Korea
Credits
13 titles
Y:SY
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.
Known For
Filmography
Duckbap House
Self
Jae Joong and Friends
fromis_9 concert ＜LOVE FROM.＞ IN JAPAN
fromis_9's Autumn Night
Self
fromis_9's Summer Night
Self
Lee Mujin Service
Guest
The Game Caterers
Self
The Silence Of IDOL
Seoyeon
We See Winter
Welcome to Heal Inn
Fromis's Room
프롤로그_프로미스의 방 엿보기
Idol School
Self - Contestant