Y:SY, also known as Yi Seoyeon (이서연; formerly romanized as Lee Seoyeon), is a South Korean singer-songwriter and rapper under H1GHR Music. She is a former member of the girl group fromis_9.
She made her solo debut on November 17, 2025 with the digital single "".
She is also known for being a contestant on the reality survival show Idol School.
Y:SY (Lee Seo-Yeon) has been suggested to play 6 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.
