Hyeon Jin moves into the same building Su Hyeon is living in. Seul Gi is not fond of Hyeon Jin. At first, the two are hostile towards each other and does not get along well. Seul Gi, however, opens up after getting saved by Hyeon Jin.
After the breaching of the Tunnel Gang's hideout, many victims are saved, and criminals are apprehended. Karimov, however, gets away and looks for an opportunity to strike Su Hyeon.
The police have found Karimov's body and perform an autopsy. The result suggests that Karimov and Kim Jong Koo's killer are the same. While trying to figure out the common denominator for all the victims, Hyeon Jin meets Yoon Jung Woo.
Su Hyeon remembers that he is from Hansol Orphanage and visits the place to find any clues about his past. Meanwhile, Hyeon Jin is noticing odd things about Su Hyeon's behavior and starts to ask questions about his past.
Seo Won Seok is trying to get the upper hand on Jae Hwan by using the list of numbered children from Hansol Orphanage. As the client wants Won Seok dead, Su Hyeon breaks into Won Seok's house but decides not to kill him.
While Seo Won Seok is campaigning for the election, Su Hyeon snipes his target down. As an assemblyman was shot in public, the police are forming a special unit to solve the case. Hyeon Jin also suspects Su Hyeon for being the killer.
Su Hyeon has regained some of his memory and suspects his relationship with Jae Hwan in the past. Su Hyeon threatens the client to cough up some information about the numbered children and Jae Hwan.
Hyeon Jin and her team find a buried body near Hansol Orphanage and files for a search warrant. As the police are getting closer to uncovering the truth, Jae Hwan pulls some strings to make sure it doesn't cause too much trouble.
While searching for Ji Hye, Hyeon Jin is attacked by Jae Hwan's henchmen. Luckily, Su Hyeon saves Hyeon Jin. Su Hyeon is furious at his client for getting Hyeon Jin hurt and confronts him.
Su Hyeon finds out about the secret behind the numbered kids. On the other hand, Hyeon Jin finds out who Su Hyeon truly is. Meanwhile, Ko Hyeon Woo orders his men to attack Su Hyeon's close ones.
After finding out about Su Hyeon's identity, the police are trying to arrest Su Hyeon. Simultaneously, the police apprehended Jae Hwan for his crimes. Su Hyeon is now waiting for his chance to kill his last target.