Jang-su (Ma Dong-seok) and Tae-jin (Kim Young-kwang) possess completely opposite personalities. As a famous martial artist, Jang-soo is selfish and never helps people in need. All he cares about is the treatment of his young daughter Do-kyung (Choi Yoo-ri) from a congenital heart disease. Meanwhile, Tae-jin is a passionate policeman, always fighting for justice. Because he followed an illegal women trafficking ring, he was harmed by a gangster group.

As the only one who has seen Tae-jin's soul, Jang-su reluctantly helps the policeman to get justice.