The prologue is very eerie. A child wearing what looks like a prison uniform wandering around a burning village, a man trying to attack the child but being attacked by someone else instead, people murdering each other while the child watches with apparent indifference...
The serial killer sends advance warning of when and where he'll kill his next victim. Jung-woo and his team get there early and search the place for the killer. He succeeds in killing his victim anyway. And no one sees him even though the police are looking for him and the victim is surrounded by dozens of people.
