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Signal
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There are those who are born monsters, but there are also those who are made into monsters by people.
Crime
Mystery
Sci-Fi & Fantasy
Drama
81
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Overview

Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
Status: Returning Series
First Air Date: 2016-01-22
Runtime: Unknown
Director: Unknown
Writer: Kim Eun-hee
Top Cast
Lee Je-hoon
Lee Je-hoon
Park Hae-young
Kim Hye-soo
Kim Hye-soo
Cha Soo-hyun
Cho Jin-woong
Cho Jin-woong
Lee Jae-han
Jang Hyun-sung
Jang Hyun-sung
Kim Bum-joo
Jung Hae-kyun
Jung Hae-kyun
Ahn Chi-soo
Kim Won-hae
Kim Won-hae
Kim Gye-chul
Jung Han-bi
Jung Han-bi
Oh Yoon-seo
Lee Yoo-jun
Lee Yoo-jun
Jung Heon-gi
Kim Min-gue
Kim Min-gue
Hwang Ui-kyung
Kang Chan-hee
Kang Chan-hee
Park Sun-woo
Im Hwa-young
Im Hwa-young
Cha Soo-min
Official Videos
[#시그널] 6분 하이라이트!
[#시그널] 6분 하이라이트!
Episodes - Season 1
You're Doomed
You're Doomed
Episode 1
Profiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.
We Still Have a Chance
We Still Have a Chance
Episode 2
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.
We Can Prevent the Killings
We Can Prevent the Killings
Episode 3
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.
We Found the Killer
We Found the Killer
Episode 4
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.
Changing the Past Alters the Present
Changing the Past Alters the Present
Episode 5
Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.
Catch Him by All Means
Catch Him by All Means
Episode 6
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.
We Must Dig Deeper
We Must Dig Deeper
Episode 7
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.
How Are You Alive?
How Are You Alive?
Episode 8
Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.
Hongwon Dong Case
Hongwon Dong Case
Episode 9
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.
Someone Has to Stop the Bad Guys
Someone Has to Stop the Bad Guys
Episode 10
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.
The One Last Case
The One Last Case
Episode 11
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.
The Case Was Manipulated
The Case Was Manipulated
Episode 12
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.
The Real Assailant
The Real Assailant
Episode 13
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.
Not Now, But Maybe In The Past
Not Now, But Maybe In The Past
Episode 14
Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty.
Is It Really You?
Is It Really You?
Episode 15
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.
If You Don't Give Up
If You Don't Give Up
Episode 16
Hae-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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