Academy-bus driver Jang Kyung-chul runs into Jang Joo-yun one snowy night and offers to fix her flat tire. Kyung-chul kills her and scatters her body parts. When a boy discovers one of Joo-yun's ears, the police are called in under the command of Section Chief Oh and Squad Chief Jang (Joo-yun's father). Kim Soo-hyun, a secret service agent of the National Intelligence Service (NIS) and Joo-yun's fiancé, vows to track down and take vengeance on Joo-yun's murderer.