Chun made his break into the entertainment industry in the KBS teen drama School 2 (1999).

He is best known for his leading roles in TV dramas such as Fashion 70's (2005),[1] Goodbye Solo (2006),[2] What's Up Fox?

[13] He also starred in the films The Aggressives (2005),[14][15] Les Formidables (2006), Hansel and Gretel (2007),[16][17] and Queen of the Night (2013).

[19] Since the early 2010's, Chun has trained Brazilian Jiu Jitsu and is a purple belt under John Frankl.

[20] In his Instagram post last June 2022, the actor shared that he has attained the black belt in Jiu Jitsu, after 11 years of hardwork.