Y:SY

Y:SY

1/22/2000 (26 years old)Seoul, South Korea

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 (13 titles)

Duckbap HouseShow

Duckbap House

Self · 2025

Jae Joong and FriendsShow

Jae Joong and Friends

2023

fromis_9 concert ＜LOVE FROM.＞ IN JAPANMovie

fromis_9 concert ＜LOVE FROM.＞ IN JAPAN

2023

fromis_9's Autumn NightShow

fromis_9's Autumn Night

Self · 2022

fromis_9's Summer NightShow

fromis_9's Summer Night

Self · 2022

Lee Mujin Service8.5Show

Lee Mujin Service

Guest · 2022

The Game Caterers8.7Show

The Game Caterers

Self · 2021

The Silence Of IDOLShow

The Silence Of IDOL

Self · 2020

We See Winter6.5Show

We See Winter

2019

Welcome to Heal Inn6.5Show

Welcome to Heal Inn

2018

Fromis's Room10.0Show

Fromis's Room

2017

프롤로그_프로미스의 방 엿보기Show

프롤로그_프로미스의 방 엿보기

2017

Idol School9.0Show

Idol School

Self - Contestant · 2017