An aging assassin with a knack for taking out society's worst encounters a young protégé eager to learn the trade. As they form an unlikely bond, the veteran killer discovers fresh purpose in her twilight years of violence...

After barely surviving a violent attack by an elusive serial killer, crime boss Jang Dong-su finds himself forming an unlikely partnership with local detective Jung Tae-seok to catch the sadistic killer simply known as "K.

A crown prince emerges as a leader during the war between Korea and Japan in 1592.