Dec 1, 2015-present
Eunseo is a member of the girl group Cosmic Girls/WJSN. Seola, Dayoung, Exy, Eunseo, Cheng Xiao, Soobin, and Yeoreum are in YTeen which is the Starship unit with Monsta X. She's part of the sub-unit 'Joy'.
She debuted as a member of WJSN on February 25, 2016 with their first mini album Would You Like?
On May 12, 2021, she debuted as a member of WJSN's sub-unit, WJSN THE BLACK, with the single album "My Attitude".