Through the Darkness (TV series)

Through the Darkness is a 2022 South Korean television series starring Kim Nam-gil, Jin Seon-kyu and Kim So-jin. It is based on the 2018 non-fiction book of the same title co-written by Korea's first criminal profiler and journalist-turned-author Ko Na-mu, which highlights Kwon's field experiences. It aired on SBS TV from January 14 to March 12, 2022, every Friday and Saturday at 22:00 (KST).

Synopsis
It is about a criminal profiler who struggles to determine the behavioural patterns of serial killers.

Main

 * Kim Nam-gil as Song Ha-young, profiler of the Criminal Behavior Analysis team at Seoul Metropolitan Police Agency's (SMPA) Scientific Investigation division.
 * Lee Chun-moo as young Song Ha-young
 * Jin Seon-kyu as Gook Young-soo, leader of the Criminal Behavior Analysis team.
 * Kim So-jin as Yoon Tae-goo, team leader of the Mobile Investigation Unit at SMPA.

Criminal Behavior Analysis team

 * Ryeoun as Jung Woo-joo, the person who provides information and analyzes various incident data. He later joins Ha-young and Young-soo's team.

Mobile Investigation Unit

 * Lee Dae-yeon as Baek Jun-sik, head of SMPA's Criminal division.
 * Kim Won-hae as Heo Gil-pyo, head of SMPA's Mobile Investigation Unit.
 * Jeong Soon-won as Nam Il-young, the youngest member of Mobile Investigation Unit who respects and follows Tae-goo unconditionally.

Others

 * Gong Sung-ha as Choi Yoon-ji, a journalist from online media Fact Today.
 * Kim Hye-ok as Park Young-shin, Ha-young's mother.

Extended

 * Go Geon-han as Yang Yong-cheol, a man who claimed to be the "Red Hat" murderer.
 * Seo Dong-gap as Kim Bong-sik, the first commander of the squadron.
 * Hong Woo-jin as Oh In-tak, a forensic officer in SMPA's forensic team and is a junior of Young-soo.
 * Oh Seung-hoon as Jo Kang-moo, a serial killer.
 * Oh Hee-joon as Kang Yoo-min
 * Han Joon-woo as Goo Young-chun, a psychopathic serial killer.
 * Kim Jung-hee as Nam Ki-tae, a psychopathic serial killer.
 * Na Cheol as Woo Ho-seong, a psychotic serial killer.

Special appearances

 * Jung Man-sik as Park Dae-woong, crime squad leader.
 * Hwang Jung-min as the key witness of a crime.
 * Oh Kyung-ju as Bang Ki-hoon, a suspect who was investigated for killing his own girlfriend.
 * Ha Do-kwon as Shin Ki-ho, the director of the online media Fact Today.

Release
It was initially reported that the series was likely to be aired in October 2021. However, it was later confirmed in November that it would premiere on January 14, 2022.