Episodes (16)

You're Doomed
S01E01 · You're Doomed

Apr 28, 2018

The main protagonist tries to help the police catch a killer that kidnapped and murdered his childhood friend 15 years ago.

We Still Have a Chance
S01E02 · We Still Have a Chance

Jan 23, 2016

The main protagonist continues to try catching the culprit that kidnapped his childhood friend and after that they began a small police force which solved outdated unsolved cases and they are starting on a popular serial killer case.

We Can Prevent the Killings
S01E03 · We Can Prevent the Killings

Jan 29, 2016

The search for the serial killer continues as the main protagonist tries to change the case by communicating with a detective from the past.

We Found the Killer
S01E04 · We Found the Killer

Jan 30, 2016

The cold case squad figures out who the serial killer is, but not before the wrong suspect turns himself in.

Changing the Past Alters the Present
S01E05 · Changing the Past Alters the Present

Feb 05, 2016

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.

Catch Him by All Means
S01E06 · Catch Him by All Means

Feb 06, 2016

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

We Must Dig Deeper
S01E07 · We Must Dig Deeper

Feb 12, 2016

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

How Are You Alive?
S01E08 · How Are You Alive?

Feb 13, 2016

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

Hongwon Dong Case
S01E09 · Hongwon Dong Case

Feb 19, 2016

Park Hae Young uncovers another layer to Lee Jae Han's disappearance. An old demon from Cha Soo Hyun's past resurfaces.

Someone Has to Stop the Bad Guys
S01E10 · Someone Has to Stop the Bad Guys

Feb 20, 2016

Know what this is about? Be the first one to add a plot.

The One Last Case
S01E11 · The One Last Case

Feb 26, 2016

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

The Case Was Manipulated
S01E12 · The Case Was Manipulated

Feb 27, 2016

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 Real Assailant
S01E13 · The Real Assailant

Mar 04, 2016

Know what this is about? Be the first one to add a plot.

Not Now, But Maybe In The Past
S01E14 · Not Now, But Maybe In The Past

Mar 05, 2016

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.

Is It Really You?
S01E15 · Is It Really You?

Mar 11, 2016

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.

If You Don't Give Up
S01E16 · If You Don't Give Up

Mar 12, 2016

Know what this is about? Be the first one to add a plot.


Signal (also know as Sigeuneol) Season 1 (2016) is released on Apr 28, 2018. Watch Signal online - the Korean Crime TV series from South Korea. Signal is directed by Won Suk Kim and created by Eun-hee Kim with Lee Jehoon and Kim Hye-su. Signal is available online on Netflix and Amazon Prime Video.

Fifteen years ago, a female child was kidnapped on the way from school. At that time, Park Hae Yeong, who was an elementary school student, witnessed the girl being taken away. A few days later, the girl was found dead, and detectives couldn't find the culprit. As time went by, Hae Yeong started distrusting the police. Fifteen years later, Hae Yeong is now a police officer and criminal profiler. One day, he finds a walkie-talkie that allows him to get in contact with Detective Lee Jae Han who is in the past. Police officers Hae Yeong, Jae Han and Cha So Hyun then set out on a journey to solve cold cases.

As know as:

Sigeuneol, Sigeuneol, Signal, シグナル, Сигнал


South Korea



Stream Service:


Production Companies:


Official Site:


Cast & Crew

More Like This