I Saw The Devil

Soo Hyun (Lee Byung Hun) is devastated and driven by revenge after finding out his pregnant fiancée has been killed. Years pass and the murderer is still free, but Soo Hyun doesn't give up. He keeps searching and finally finds a few people who might be responsible.

Soo Hyun manages to find the person who is strongly suspected to be the killer of her fiancé, Kyung Chul (Choi Min Sik). After some investigation, evidence is found proving that he is the murderer Soo Hyun is looking for. Kyung Chul, a psychopath, committed brutality by killing, raping, and mutilating his victims.

Fueled by rage, Soo Hyun plants a tracking device in Kyung Chul by making him swallow a pill, allowing him to monitor the killer's every move.

Soo Hyun takes revenge for his fiancée's death in a sadistic manner, and the fight between them is filled with bloody scenes. Ironically, a deep feeling of vengeance and grief has turned him into the very monster he sought to punish.