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