Major crimes unit detective Seong-jin arrests Tae-sung for petty crimes, but shocked to find out that he is the notorious serial killer. However, Seong-jin becomes doubtful of his identity as the serial murder case is investigated.

One late afternoon, a mysterious guy tries to hitchhike in the middle of nowhere. But nobody seems to give him a ride. It is getting quite dark, a small van driver suddenly stops his car because he saw a man standing in front of his vehicle and the strange guy gets in the car abruptly.