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Series

Signal

2016Unknown runtime8.2 / 102 seasons


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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Available in US

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Season guide

Season 1

Play Season

16 episodes available

Episode 1: You're Doomed

1h 7m

Profiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.

Episode 2: We Still Have a Chance

1h 6m

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.

Episode 3: We Can Prevent the Killings

1h 5m

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.

On screen

Cast & Characters

Lee Je-hoon

Park Hae-young

Kim Hye-soo

Cha Soo-hyun

Cho Jin-woong

Lee Jae-han

Jang Hyun-sung

Kim Bum-joo

Jung Hae-kyun

Ahn Chi-soo

Kim Won-hae

Kim Gye-chul

Jung Han-bi

Oh Yoon-seo

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Episode 4: We Found the Killer

1h 5m

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.

Episode 5: Changing the Past Alters the Present

1h 8m

Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.

Episode 6: Catch Him by All Means

1h 10m

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.

Episode 7: We Must Dig Deeper

1h 7m

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.

Episode 8: How Are You Alive?

1h 14m

Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.

Episode 9: Hongwon-dong Case

1h 14m

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.

Episode 10: Someone Has to Stop the Bad Guys

1h 12m

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.

Episode 11: The One Last Case

1h 18m

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.

Episode 12: The Case Was Manipulated

1h 18m

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.

Episode 13: The Real Assailant

1h 14m

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.

Episode 14: Not Now, but Maybe in the Past

1h 14m

Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty.

Episode 15: Is It Really You?

1h 12m

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.

Episode 16: If You Don't Give Up

1h 29m

Hae-young is in critical condition after being shot while meeting with Sung-bum. In 2000, Jae-han has been captured by Bum-joo.

Lee Yoo-jun

Jung Heon-gi

Kim Min-gue

Hwang Ui-kyung

Kang Chan-hee

Park Sun-woo

Im Hwa-young

Cha Soo-min