A team of tenacious detectives study the minds of murderers at a time when Korea's first serial murders terrorized the nation. Based on true events.
E1 · Red Cap Incident
Song Ha-yeong pursues a criminal known for targeting young women. Kook Yeong-su looks to form a team of criminal behavioral analysts.
E2 · Habits of Criminals
Ha-yeong consults a criminal to understand a killer’s motives. An arrest leads to a startling interrogation session and a break in the case.
E3 · Ha-yeong Meets Tae-gu Again
The grisly murder of a child catches the attention of Ha-yeong and Yeong-su. A determined police captain clashes with the team.
E4 · What Must We Remember?
When a suspect’s home is searched, the police make a gruesome discovery. Ha-yeong and Yeong-su grow frustrated as the investigation continues.
E5 · Looking into the Minds of Evil
A crooked new police chief causes trouble for the team. The deaths of a professor and his wife touch off a series of brutal murders.
E6 · The Man With the Hiking Boots
Yoon Tae-gu and Kim Bong-sik seek to set boundaries on the behavioral analysis team. A complex investigation sends the police down a twisted path.
E7 · A Scary Wolf Inside the Rabbit Burrow
Ha-yeong spends time with his mother on his birthday. With two killers on the loose, the investigators are faced with high-pressure stakes.
E8 · There Are No Perfect Crimes
A chase takes a risky turn. When a suspect asks for a high-ranking officer, Ha-yeong hatches a plan. A search for victims' bodies continues.
E9 · Becoming the Monster
The behavioral analysis team agrees to an interview with a journalist. Ha-yeong seeks to enter the killer’s mind, but it takes a toll on him.
E10 · I Just Liked It
During interviews and crime scene reenactments, Ha-yeong and the police dive deep into a ruthless suspect's psyche and past trauma.
E11 · The Victims And Their Families
A horrific accident forces Ha-yeong to reflect on the mental impact of his work. Meanwhile, two people go missing from a karaoke bar, raising suspicions.
E12 · The Hearts of Criminals
Police and the analysis team investigate a murder suspect who is known for charming women and luring them into his car.
