Lee Seo-yeon, under the stage name Y:SY, is a South Korean singer and former member of the girl group fromis_9. Born in Seoul, South Korea (January 22, 2000), Y:SY's music career began as a trainee in YG Entertainment as one of the trainees under YG Entertainment's pre-debut project "Future 2NE1". She left the company before joining Idol School, a survival show, which led to her debut after securing seventh place. The group officially debuted on January 24 Read more on Last.fm