Birth of a Monster
Detective Jang’s missing notebook mysteriously appears at Lee Hyun’s home. Following the clues in the notebook, Ji-An and Lee Hyun arrive at the original home of Lee Joon-Yeong. They discover a casket with the bones of what may be Joon-Yeong’s mother. Park Joo-Ah, one of the family caregivers, comes forward and relates Joon-Yeong’s childhood and the death of everyone else living there. Detective Ji-An’s stalking skills are put to use resolving key issues Lee Hyun is categorizing in his head, and he realizes that every time he visited Korea, he was given a gift box which contained clues left by his brother. Joo Yeong-Jae, a student, is murdered and the adoptive parents' actions are questioned.
More from Season 1
Episode 1
Every Child's Story Begins with Their Parents
Lee Hyun, a Criminologist working for the New York Police, returns to Korea to investigate a recent email that he received. He hopes to recover all of his early memories that he lost after the tragic murder of his father. On arrival at the airport, he deciphers some cryptographic symbology that leads him to a recent murder scene. Team 1 Investigative Unit arrives while he is there and mistakes him for the new Team Leader. However, Cha Ji-An, the Lead Investigator knows who he is because she has stalked him since her youth.
Episode 2
Hello, Monster
Plagued by insidious thoughts planted by serial killer Lee Joon-Yeong and recent events; Lee Hyun's father believes that he is becoming a monster. He isolates him in the basement to protect both him and the world. Joon-Yeong escapes from prison, murders his father and absconds with his brother. Lee Hyun discovers a painting at a murder scene that he believes may be his brother Lee Min’s.
Episode 3
Thou Shall Not Kill, But...
Team 1 working with Lee Hyun come up with a profile of the victims. Cha Ji-An races to the next suspected victim and is successful in capturing the murder suspect but complications arise as there is no proof and the target drops any charges. Attorney Jung Sun-ho arrived during the interrogation process and thwarts Lee Hyun and Cha Ji-An efforts to get a confession.
Episode 4
The Suspect, Lee Hyun
The murder suspect, Yang Seung-Hoon, leaves on the first available plane to China. Lee Hyun illegally uses Cha Ji-An’s computer and informs Chinese authorities of his drug trafficking. They find evidence at his house and arrest him on arrival. Team Leader Kang Eun-Hyuk and Planning Officer Hyun Ji-Soo are reprimanded by the Deputy Chief for mishandling the case. Cha Ji-An is transferred to another department. Detective Yang sets up a meeting with Lee Hyun to relay some pertinent information concerning Joon-Ho. Detective Yang is murdered, and he becomes the prime suspect.
Episode 5
Borne Back Ceaselessly into the Past
Cha Ji-An is going stir crazy wanting to investigate so she joins up with Lee Hyun. They evade capture by hiding in a closet at the crime scene. They start bonding while he hides out at her place, and she attends his wounds. He convinces her to spy for him. Together they are able to figure out who the murderer is and his next target. The Team Leader, Kang Eun-Hyuk, makes the arrest. He and the Planning officer convince the Deputy Chief to return Cha Ji-An to the team.
Episode 6
The Blood of a Murderer
Lee Hyun meets with Prosecutor Shin Jang-Ho concerning Park Young-Chul's case. Jang-Ho informs Lee Hyun has experienced two cases of memory loss in relationship to his parents' deaths. Also, that Lee Joon-Yeong never leaves any bodies to be found for his murder cases. In order to investigate the Park Jeung-Woo murder case, Lee Hyun is coerced to join Team 1 as an official advisor. Lee Hyun hires Jung-Sun-ho to be Lee Jung-Ha’s attorney because he believes he is innocent.
