After beating Joo-yun unconscious, Kyung-chul kills her with a makeshift guillotine at his home and scatters her body parts into a local stream. 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). Heartbroken, 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.