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.

Other name:

이서연,

서연,

Lee Seo-yeon,

Yi Seo-yeon

Gender:

Female

Birthday:

Jan 22, 2000

Place of birth:

Seoul, South Korea

Social accounts: