Hee Sung was brought to an emergency room without any consciousness. Luckily, he wakes up, but Ji Won heard something unexpected while Hee Sung was unconscious. Moo Jin tries to talk to the witness to get to the bottom of the story.

Hyun Su asks Moo Jin to look for Hae Su in order to find the accomplice. Ji Won's team gets to re-investigate the Yeonju City serial murder. Meanwhile, Hyun Su finally meets Hae Su.