Episode 1
You're Doomed
Profiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.
Where to watch Signal
TV series
Signal
2016TV-MA2 seasons8.2 / 10
There are those who are born monsters, but there are also those who are made into monsters by people.
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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Where to watch in United States
Checked Jul 22, 2026
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Synopsis
Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
Season 1 episodes
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Episode 2
We Still Have a Chance
The statute of limitations is lifted after the suspect's arrest. Hae-young joins Soo-hyun's team for the newly established cold case squad.
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Episode 3
We Can Prevent the Killings
Reality changes after Hae-young exchanges information with Jae-han. Hae-young tries to work together with Jae-han in 1989 to prevent the next murder.
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Episode 4
We Found the Killer
The 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 real killer.
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Episode 5
Changing the Past Alters the Present
Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.
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Episode 6
Catch Him by All Means
Seeking vengeance for the events that lead to the death of his daughter, Kyung-tae commits a kidnapping after getting out of prison for burglary.
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Episode 7
We Must Dig Deeper
Jae-han arrests Se-kyu for the serial burglary case, but the culprit is freed after serving a short sentence; Kyung-tae still commits murder.
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Episode 8
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.
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Episode 9
Hongwon-dong Case
Hae-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.
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Episode 10
Someone Has to Stop the Bad Guys
The bodies discovered in the mountains appear to be more victims of the 1997 serial murder case. Jae-han learns that Soo-hyun became team leader.
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Episode 11
The One Last Case
Hae-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.
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Episode 12
The Case Was Manipulated
Hae-young becomes a suspect for the murder of Chi-soo. Jae-han realizes who the principle offender of the attack on Hye-seung is.
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Episode 13
The Real Assailant
Soo-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 the past.
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Episode 14
Not Now, but Maybe in the Past
Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty.
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Episode 15
Is It Really You?
Hae-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 death.
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Episode 16
If You Don't Give Up
Hae-young is in critical condition after being shot while meeting with Sung-bum. In 2000, Jae-han has been captured by Bum-joo.
Where to watch SignalEpisode information updated Jul 22, 2026
More about Signal
Cast
Lee Je-hoonPark Hae-young
Kim Hye-sooCha Soo-hyun
Cho Jin-woongLee Jae-han
Jang Hyun-sungKim Bum-joo
Jung Hae-kyunAhn Chi-soo
Kim Won-haeKim Gye-chul
Jung Han-biOh Yoon-seo
Lee Yoo-junJung Heon-giCredits
- Created by
- Kim Eun-hee, Kim Won-suk
Production details
- Status
- Ended
- Series type
- Scripted
- Episodes
- 17
- Original language
- Korean
- Original title
- 시그널
Networks & production
tvNSouth Korea
AStorySouth Korea
Studio DragonSouth Korea
BA EntertainmentSouth Korea
Baram PicturesSouth Korea
Themes
awestruckbutterfly effectchanging the past or futurecorruptiondarkinvestigationmurdersignal
