She debuted as a member and leader of South Korean girl group WJSN formed under Starship and Yuehua in 2016.

[6][7][full citation needed] Exy collaborated with Crucial Star on the single "쓸어버려", released on September 1, 2015.

[14] In August 2016, Exy, together with Seola, Soobin, Eunseo, Cheng Xiao, Yeoreum, and Dayoung teamed up with label mate Monsta X to form the unit "Y-Teen".

Y-teen was a project unit group that promoted as CF models for KT's phone fare service and would release EPs, music videos, and various entertainment content.

[15] In April 2017, it was announced that Exy would be collaborating with rapper Euna Kim on the single "Love Therapy".

[20] In January 2021, She wrote lyrics for label mate Cravity's title track "My Turn" and "Bad Habits" from their 3rd EP, Season 3.

[21] In mid-March 2021, Exy co-wrote the lyrics for The Boyz's "Prism" from their 1st Japanese studio album, Breaking Dawn.