The K2

Kim Je Ha, also known as K2 (Ji Chang Wook), is a former mercenary who turns into a fugitive after being wrongly accused of murdering his girlfriend. He knows the real murderer is Park Kwan Soo (Kim Kap Soo).

K2 gets a job as a bodyguard for Choi Yoo Jin, the wife of a presidential candidate, Jang Se Joon (Jo Sung Ha). K2 sees this as a chance to get back at Kwan Soo, who is Se Joon's political enemy.

His job includes looking after Kwan Soo's daughter, Go An Na (Im Yoon Ah). But as he spends time with An Na, K2 starts falling for her. This makes him question his original plan for revenge. Will he stick to his plan, or will his new feelings change everything?

This action-packed drama is filled with exciting fight scenes. K2 shows off his skills in various martial arts like taekwondo, aikido, and jiu-jitsu.