I Saw the Devil

One night, a school-bus driver named Jang Kyung-chul encounters a pregnant woman named Jang Joo-yun and offers to fix her flat tire. After beating her unconscious, Kyung-chul dismembers Joo-yun at his home, and while doing so, Joo-yun's ring falls. Kyung-chul ignores it and scatters the body parts into a local stream. When a boy discovers one of Joo-yun's ears, the police arrive en masse to conduct a search, led by Section Chief Oh and Squad Chief Jang, Joo-yun's devastated father. The victim's fiancé, Kim Soo-hyun, an NIA officer is also present and vows to take revenge against the murderer.