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A serial rapist-murdered killed over more than then women and has never been caught for it. It is one of Korea's most famous true crime case in the 80's, which got endlessly retold on television as it hasn't been solved as of yet. Signal is a Crime Science Fiction series that is currently running and has 1 seasons (16 episodes). The series first aired on January 22, 2016. It has mostly positive reviews from critics and viewers, who have given it an IMDb score of 8.7.

Signal is available for streaming on the tvN website, both individual episodes and full seasons. You can also watch Signal on demand at Netflix online.

tvN
1 Season, 16 Episodes
January 22, 2016
Crime Science Fiction
8.7/10
Cast: Lee Jehoon, Hye-su Kim, Jin-woong Cho, Hyun-Sung Jang
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Signal Full Episode Guide

  • Lee Jae Han is set on bringing down Kim Bum Joo, despite knowing that he's going to die, but a certain transmission is about to make all the difference.

  • Park Hae Young is framed and arrested for the murder of the Section Chief. Cha Soo Hyun sets out to save Lee Jae Han and to find the one witness who can bring down their enemy.

  • Following the trail the Section Chief left, Park Hae Young uncovers the truth behind his brother's death. Meanwhile, Cha Soo Hyun finds Lee Jae Han's radio in Hae Young's possession.

  • The Cold Case Squad secretly reinvestigates the Injoo gang rape case. Lee Jae Han finds out the connection Park Hae Young has to the case.

  • Park Hae Young becomes the prime suspect for the Section Chief's murder. Meanwhile, Lee Jae Han must find out who this "one" is before it's too late.

  • The Cold Case Squad catches the Hongwon-dong serial killer, but Lee Jae Han's determination changes the past again.

  • The Cold Case Squad is assigned to the serial murder, but the last the victims isn't identified. Cha Soo Hyun revisits a past trauma.

  • The cold case squad finds Shin Da Hye, who has been living under the murder victim's identity.

  • Lee Jae Han catches the real culprit behind the burglaries, unwittingly changing the past for the worse again.

  • Park Hae Young figures out that Oh Kyung Tae's true objective is the father of the girl he kidnaps.

  • Park Hae Young begins asking questions about Lee Jae Han. Meanwhile, the police force in Lee Jan Han's time struggles with a string of larceny cases.

  • During the investigation of the serial murders, Park Hae Young discovers that the radio transmissions are actually connecting him to the past.

  • After the Kim Yoon Jung kidnapping case, the Chief of police creates a cold case squad. Their first case is the infamous Gyeonggi Nambu serial murders.

  • Haunted by a classmate's kidnapping 15 years ago, Park Hae Young becomes a police profiler who's lost faith in the police force. This all changes when he stumbles upon an old radio that's receiving transmissions from the past.