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🔔 Notify me about new seasonsSynopsis
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.
Themes
Episodes
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- E1 Red Cap IncidentNext upJan 14, 2022 · 68 min
Synopsis

Song Ha-yeong pursues a criminal known for targeting young women. Kook Yeong-su looks to form a team of criminal behavioral analysts.
Guest stars: Oh Seung-hoon (Jo Kang-moo), Kim Yun-seul (Cotton candy girl), Kim Kwan-mo (Undercover cop in drag), Choi Da-young (Nurse), Hwang Jeong-min ('Turtle' supermarket owner), Heo Seon-haeng (Medical examiner), Kim Deok-ju (Hwa-yeon's landlord), Lee Si-young (Neighborhood single mother)
- E2 Habits of CriminalsJan 15, 2022 · 67 min
Synopsis

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.
Guest stars: Oh Seung-hoon (Jo Kang-moo), Yoon Hye-ree (Choi Hwa-yeon), Oh Kyung-joo (Bang Ki-hoon), Oh Hee-jun (Kang Yoo-min), Ko Gun-han (Yang Yong-chul), Moon Dong-hyeok (Moon Tae-soo), Kim Hyun (Hwa-yeon's mother), Jeong Man-sik (Park Dae-woong)
- E3 Ha-yeong Meets Tae-gu AgainJan 21, 2022 · 70 min
Synopsis

The grisly murder of a child catches the attention of Ha-yeong and Yeong-su. A determined police captain clashes with the team.
Guest stars: Noh Ha-yeon (Lee Soo-hyun), Lee Ki-seop (Kang Jin-goo), Lee Jong-yoon (Jang Deuk-hok), Bae Sung-il (Detective), Jung Chung-gu (Film developer), Park Yu-mil (Lim Hyun-joo), Lee Jae-eun (Mrs. Kim), Ki Hwan (Soo-hyun's father)
- E4 What Must We Remember?Jan 22, 2022 · 65 min
Synopsis

When a suspect’s home is searched, the police make a gruesome discovery. Ha-yeong and Yeong-su grow frustrated as the investigation continues.
Guest stars: Ki Hwan (Soo-hyun's father), Lee Hun-joo (Soo-hyun's mother), Kwon Eun-seong (Lee Ji-wook), Son Young-soon (Lee Chun-young), Woo Jung-kook (Cho Hyun-gil), Jung Young-keum (Hyun-gil's landlord), Choi Nam-wook (Convenience store owner), Han Jun-woo (Gu Young-chun)
- E5 Looking into the Minds of EvilJan 28, 2022 · 68 min
Synopsis

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.
Guest stars: Woo Jung-kook (Cho Hyun-gil), Han Jun-woo (Gu Young-chun), Ku Sung-hwan (Hwang Dae-sun), Seo Myung-chan (Han Seok-hoon), Hwang In-jun (Detective), Oh Kyu-taek (Man drinking with prosecutor), Sun Yul-woo (Detective)
- E6 The Man With the Hiking BootsJan 29, 2022 · 66 min
Synopsis

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.
Guest stars: Han Jun-woo (Gu Young-chun), Sun Yul-woo (Detective), Hong Ye-ji (Bookstore employee), Kim Joong-hee (Nam Ki-tae)
- E7 A Scary Wolf Inside the Rabbit BurrowFeb 25, 2022 · 71 min
Synopsis

Ha-yeong spends time with his mother on his birthday. With two killers on the loose, the investigators are faced with high-pressure stakes.
Guest stars: Han Jun-woo (Gu Young-chun), Sun Yul-woo (Detective), Kim Joong-hee (Nam Ki-tae), Lee Geun-hoo (Kwak Man-hyun), Lee Jae-woo (Detective Kim), Kim Bum-joon (Witness), Yoo Yong (Detective), Lee Dong-kyu (Anchorman)
- E8 There Are No Perfect CrimesFeb 26, 2022 · 65 min
Synopsis

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.
Guest stars: Han Jun-woo (Gu Young-chun), Kim Joong-hee (Nam Ki-tae)
- E9 Becoming the MonsterMar 4, 2022 · 66 min
Synopsis

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.
Guest stars: Sun Yul-woo (Detective), Kim Joong-hee (Nam Ki-tae), Kim Gyeong-min (Professor An), Seong No-jin (Forensics examiner), Kim Joo-ah (Columbarium employee), Choi Min-hyeok (Victim), Han Dae-gwan (Victim's father)
- E10 I Just Liked ItMar 5, 2022 · 67 min
Synopsis

During interviews and crime scene reenactments, Ha-yeong and the police dive deep into a ruthless suspect's psyche and past trauma.
Guest stars: Sun Yul-woo (Detective), Kim Joong-hee (Nam Ki-tae), Kim Nak-kyun (Detective), Choi Sol-hee (Yang Ji-sook), Na Chul (Woo Ho-sung)
- E11 The Victims And Their FamiliesMar 11, 2022 · 73 min
Synopsis

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.
Guest stars: Lee Cheon-mu (Song Ha-young (young)), Moon Dong-hyeok (Moon Tae-soo), Kim Hyun (Hwa-yeon's mother), Jeong Man-sik (Park Dae-woong), Choi Sol-hee (Yang Ji-sook), Na Chul (Woo Ho-sung), Hong Eun-jeong (Manyeon bus stop woman), Lee Ye-joo (Christmas tree girl)
- E12 The Hearts of CriminalsMar 12, 2022 · 68 min
Synopsis

Police and the analysis team investigate a murder suspect who is known for charming women and luring them into his car.
Guest stars: Jeong Man-sik (Park Dae-woong), Na Chul (Woo Ho-sung), Kim Borana (Massage parlor owner), Kim Bong-soo (Ji-sook's father), Kim Bong-hee (Ji-sook's mother)
Cast & crew
Created by Kim Mi-joo, Lee Seul-gi
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Kim Nam-gil
Kim So-jin
Jin Sun-kyu
Ryeoun
Lee Dae-yeon
Jung Soon-won
Kim Won-hae
Hong Woo-jin
Jo Young-jin
Lee Haney
Kim Hye-ok
Seo Dong-gab








