Oyunculuk
이서연
- Doğum
- 22 Ocak 2000 (26 yaşında)
- Doğum yeri
- Seoul, South Korea
- Filmler
- 1
- Diziler
- 9
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.
