Dong Soo deducts that there may have been a man who used to do the things that Do Jin is doing now. While looking for that man, the team finds a detective named Baek Woo Jin. The team gets one step closer to the truth from what they hear from him.

Prosecutor Yoo joins in the investigation and personally visits Kang Do Sik's house, who is responsible for Si Hyun parents' death, and as a result, finds himself in the hospital. Si Hyun sketches a picture that's identical to the scar Prosecutor Yoo gets from a chase and later finds out Kim Do Jin is behind his kidnapping. She heroically saves her brother moments before Detective Kang loses his chance to arrest Kim Do Jin.