S1 E1 • Killer Kim Su Hyeon

A young, abandoned child who lost his memories is brought up by a killer, and as a result, the child grew up as a killer. Kim Su Hyeon is living with Pavel who raised him. Su Hyeon plans to make Pavel, who suffers from Alzheimer’s retire and take care of him. When he asks his broker, Phillip, to take care of his guns at his other hideouts, he gets a job offer from a mysterious woman. Meanwhile, Do Hyeon Jin comes across with a case that Su Hyeon is involved in.

Première diffusion : 23 mars 2019

S1 E2 • New Tenant

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. Meanwhile, Su Hyeon receives a threatening message from someone.

Première diffusion : 24 mars 2019

S1 E3 • A Friend that Made Paper Planes

After the breaching 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. Although Su Hyeon doesn’t have memories of his past, he remembers an old friend that used to like to make paper planes. Coincidentally, Hyeon Jin recalls that she used to like paper planes.

Première diffusion : 30 mars 2019

S1 E4 • The Common Denominator

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 who seems to know the common denominator. Meanwhile, Su Hyeon is finding information about Hansol Orphanage.

Première diffusion : 31 mars 2019

S1 E5 • Hansol Orphanage

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 behaviour and starts to ask questions about his past. As more questions get answered, Hyeon Jin finds out who Seul Gi really is.

Première diffusion : 6 avril 2019

S1 E6 • Failing the Mission

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. The client is displeased and threatens Su Hyeon that those around him will be killed if he doesn’t finish the job.

Première diffusion : 7 avril 2019

S1 E7 • Sniping the Target

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 that Su Hyeon is the killer and question him. Meanwhile, after hearing the news about Seo Won Seok, Jae Hwan becomes nervous and starts to suspect those around him.

Première diffusion : 13 avril 2019

S1 E8 • The List

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. Meanwhile, the police hear about the existence of the list of disappeared children from Hansol Orphanage.

Première diffusion : 14 avril 2019

S1 E9 • The Buried Body

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. Meanwhile, Su Hyeon finds out who his father is.

Première diffusion : 20 avril 2019

S1 E10 • Confronting the Client

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. Once again, Ko Hyeon Woo reminds Su Hyeon of the consequences of not following his orders.

Première diffusion : 21 avril 2019

S1 E11 • Secrets Getting Revealed

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.

Première diffusion : 27 avril 2019

S1 E12 • The Last Target

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. His friends, however, ask him to stop and forget about what he is about to do.

Première diffusion : 28 avril 2019