TV series
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.
Streaming, rental and purchase options
Checked Nov 6, 2026
Through the Darkness is available to stream on OnDemandKorea in United States. Use the direct links below to open the provider.
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.
Choose an episode, then use the watch options above for the show.
Episode 1
Song Ha-yeong pursues a criminal known for targeting young women. Kook Yeong-su looks to form a team of criminal behavioral analysts.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Oh Seung-hoon, Kim Yun-seul, Kim Kwan-mo, Choi Da-young, Hwang Jeong-min, Heo Seon-haeng, Kim Deok-ju, Lee Si-young
Episode 2
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.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Oh Seung-hoon, Yoon Hye-ree, Oh Kyung-joo, Oh Hee-jun, Ko Gun-han, Moon Dong-hyeok, Kim Hyun, Jeong Man-sik
Episode 3
The grisly murder of a child catches the attention of Ha-yeong and Yeong-su. A determined police captain clashes with the team.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Noh Ha-yeon, Lee Ki-seop, Lee Jong-yoon, Bae Sung-il, Jung Chung-gu, Park Yu-mil, Lee Jae-eun, Ki Hwan
Episode 4
When a suspect’s home is searched, the police make a gruesome discovery. Ha-yeong and Yeong-su grow frustrated as the investigation continues.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Ki Hwan, Lee Hun-joo, Kwon Eun-seong, Son Young-soon, Woo Jung-kook, Jung Young-keum, Choi Nam-wook, Han Jun-woo
Episode 5
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.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Woo Jung-kook, Han Jun-woo, Ku Sung-hwan, Seo Myung-chan, Hwang In-jun, Oh Kyu-taek, Sun Yul-woo
Episode 6
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.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Han Jun-woo, Sun Yul-woo, Hong Ye-ji, Kim Joong-hee
Episode 7
Ha-yeong spends time with his mother on his birthday. With two killers on the loose, the investigators are faced with high-pressure stakes.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Han Jun-woo, Sun Yul-woo, Kim Joong-hee, Lee Geun-hoo, Lee Jae-woo, Kim Bum-joon, Yoo Yong, Lee Dong-kyu
Episode 8
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.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Han Jun-woo, Kim Joong-hee
Episode 9
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.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Sun Yul-woo, Kim Joong-hee, Kim Gyeong-min, Seong No-jin, Kim Joo-ah, Choi Min-hyeok, Han Dae-gwan
Episode 10
During interviews and crime scene reenactments, Ha-yeong and the police dive deep into a ruthless suspect's psyche and past trauma.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Sun Yul-woo, Kim Joong-hee, Kim Nak-kyun, Choi Sol-hee, Na Chul
Episode 11
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.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Lee Cheon-mu, Moon Dong-hyeok, Kim Hyun, Jeong Man-sik, Choi Sol-hee, Na Chul, Hong Eun-jeong, Lee Ye-joo
Episode 12
Police and the analysis team investigate a murder suspect who is known for charming women and luring them into his car.
Directed by Park Bo-ramWritten by Seol Yi-naGuest stars Jeong Man-sik, Na Chul, Kim Borana, Kim Bong-soo, Kim Bong-hee
Episode information updated Nov 13, 2026
Kim Nam-gilSong Ha-young
Kim So-jinYoon Tae-goo
Jin Sun-kyuKook Young-soo
RyeounJung Woo-joo
Lee Dae-yeonBaek Jun-shik
Jung Soon-wonNam Il-young
Kim Won-haeHeo Gil-pyo
Hong Woo-jinOh In-tak
SBSSouth Korea
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