Y:SY
Acting
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.
As actor 13
Lee Mujin Service
2022
The Game Caterers
2021
Jae Joong and Friends
2023
The Silence Of IDOL
2020
Duckbap House
2025
Idol School
2017
fromis_9's Autumn Night
2022
fromis_9's Summer Night
2022
Fromis's Room
2017
We See Winter
2019
fromis_9 concert ＜LOVE FROM.＞ IN JAPAN
2023
Welcome to Heal Inn
2018
프롤로그_프로미스의 방 엿보기
2017