Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take vengeance against the killer, even if it means that he must become a monster himself.

A small band of Korean soldiers is sent to patrol near a guard post and they find corpses scattered all over the area. They launch an investigation to find the truth behind the mystery.

During the invasion of Normandy the photograph of a slim Korean man in German uniform was found. It transpired that the man had served as a soldier in the Japanese, Russian and German armies. His incredible story inspired director Kang Je-Gyu to create this epic war drama.