Signal (2016–present)
netflix
Plot
Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
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Next episode: S02E01 — Episode 1 · November 30, 2026 countdown
Highest-rated episodes all ranked
- 01
How Are You Alive?Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago. - 02
You're DoomedProfiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime. - 03
Hongwon-dong CaseHae-young learns that Chi-soo and Jae-han met in 1999 during a case in Inju. After serving time for the crime, Hae-young's brother had killed himself.
Episodes by season
Season01
- S01E01You're DoomedJanuary 22, 2016Profiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.
- S01E02
We Still Have a ChanceJanuary 23, 2016The statute of limitations is lifted after the suspect's arrest. Hae-young joins Soo-hyun's team for the newly established cold case squad. - S01E03
We Can Prevent the KillingsJanuary 29, 2016Reality changes after Hae-young exchanges information with Jae-han. Hae-young tries to work together with Jae-han in 1989 to prevent the nex - S01E04
We Found the KillerJanuary 30, 2016The ninth victim is Won-kyung, the woman Jae-han loves. A driver turns himself in, but Soo-hyun and Jae-han determine that his son is the re - S01E05
Changing the Past Alters the PresentFebruary 5, 2016Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the - S01E06
Catch Him by All MeansFebruary 6, 2016Seeking vengeance for the events that lead to the death of his daughter, Kyung-tae commits a kidnapping after getting out of prison for burg - S01E07
We Must Dig DeeperFebruary 12, 2016Jae-han arrests Se-kyu for the serial burglary case, but the culprit is freed after serving a short sentence; Kyung-tae still commits murder - S01E08Season's bestHow Are You Alive?February 13, 2016Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.
- S01E09Hongwon-dong CaseFebruary 19, 2016Hae-young learns that Chi-soo and Jae-han met in 1999 during a case in Inju. After serving time for the crime, Hae-young's brother had kille
- S01E10
Someone Has to Stop the Bad GuysFebruary 20, 2016The bodies discovered in the mountains appear to be more victims of the 1997 serial murder case. Jae-han learns that Soo-hyun became team le - S01E11
The One Last CaseFebruary 26, 2016Hae-young and Soo-hyun arrest Jin-woo after coming to the conclusion that he is the killer. Hae-young asks Jae-han about the Inju rape case. - S01E12
The Case Was ManipulatedFebruary 27, 2016Hae-young becomes a suspect for the murder of Chi-soo. Jae-han realizes who the principle offender of the attack on Hye-seung is. - S01E13
The Real AssailantMarch 4, 2016Soo-hyun and the others mourn after confirming that the remains belong to Jae-han. Hae-young learns that Jae-han used to look after him in t - S01E14
Not Now, but Maybe in the PastMarch 5, 2016Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty. - S01E15
Is It Really You?March 11, 2016Hae-young is arrested for the murder of Chi-soo. Soo-hyun hears Jae-han apologizing over the radio for not being able to prevent Sun-woo's d - S01E16
If You Don't Give UpMarch 12, 2016Hae-young is in critical condition after being shot while meeting with Sung-bum. In 2000, Jae-han has been captured by Bum-joo.
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