He is best known for being a member of South Korean boy group U-KISS[1] formed by NH Media in 2008.

[3] Kiseop was born on January 17, 1991, in Seoul, South Korea where he lived with his parents and his older sister.

[4] Before officially joining U-KISS, Kiseop appeared in their debut music video Not Young.

Kiseop has appeared on the second season of Ulzzang Shidae but was taken off the show because of U-KISS' tight schedule.

In 2011, Kiseop started his acting career in an MBC sitcom titled Real School along with his fellow member Eli Kim.

In 2012, Kiseop, Soohyun, Eli and Kevin participated in the drama KPOP The Ultimate Audition, having small cameo appearances in three episodes acting as a senior idol group to the main cast.

[15] On January 24, 2022, Kiseop signed an exclusive contract with Tango Music, with the announcement stating he is once again part of U-KISS.