A bloodthirsty beast on a manhunt rages through the mountainous landscape as the plague rages in Korea during the Middle Ages.

When Su-hyuk is released from jail after a decade, he finds out that he has a daughter and wants to quit his criminal organisation, but his boss is not ready to let him go.

Introverted high school student Dong-hyun accidentally falls on top of Pan-soo, a former gangster, and discovers that they have swapped bodies.