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.
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Y:SY — movies and TV shows
8.5SeriesLee Mujin Service
2022
8.7SeriesThe Game Caterers
2021
SeriesJae Joong and Friends
2023
SeriesThe Silence Of IDOL
2020
9.0SeriesIdol School
2017
SeriesDuckbap House
2025
Seriesfromis_9's Autumn Night
2022
6.5SeriesWelcome to Heal Inn
2018
Seriesfromis_9's Summer Night
2022
10.0SeriesFromis's Room
2017
6.5SeriesWe See Winter
2019
Series프롤로그_프로미스의 방 엿보기
2017
Filmfromis_9 concert ＜LOVE FROM.＞ IN JAPAN
2023