Seul Hae finds a picture while searching through one of Cha Woong's boxes and realizes that there is an unpleasant connection between her dad and Cha Woong. However, Cha Woong chooses to run away from the situation by moving to a new house. Adviser Choi then tries to explain the details regarding the Full Moon Murder, but there is no way for Choi to talk to Seul Hae.

Head Yoon lies unconscious at the hospital, and it turns out that the culprit is none other than her closest partner. Realizing that she has made the wrong call, Seul Hae starts the investigation from the beginning, focusing on the right suspect. The investigation continues, and Seul Hae and Cha Woong come up with a little magic show that would lead the suspect into confessing the hard evidence.