The Best Episodes of Signal

Episode Ratings & Analysis

Discover the best and most memorable episodes of Signal, from fan favorites to critically acclaimed moments. Explore detailed ratings, episode summaries, and visualize how the show's quality evolved over time.

 Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.

2 Seasons

17 Episodes

Returning Series

Crime Mystery Sci-Fi & Fantasy Drama

Best Episodes

S1E1 - You're Doomed ★ 0.0

S1E2 - We Still Have a Chance ★ 0.0

S1E3 - We Can Prevent the Killings ★ 0.0

Worst Episodes

★ 0.0/10

You're Doomed

S1:E1

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

BaSsOo7 May 29, 2023

That was like a movie in and of itself! Damn.

★ 0.0/10

We Still Have a Chance

S1:E2

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.

BaSsOo7 May 30, 2023

Finally, a time travel sci-fi that tackles the Bootstrap paradox.

★ 0.0/10

We Can Prevent the Killings

S1:E3

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.

BaSsOo7 May 31, 2023

I was gonna say, if they solved the case back then they shouldn't have been assigned the case now! B...

★ 0.0/10

We Found the Killer

S1:E4

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.

Snydez Jan 1, 2019

damn! tearjerker! ok, now the second part closed, ..

★ 0.0/10

Changing the Past Alters the Present

S1:E5

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

BaSsOo7 Jun 2, 2023

I like how they try to make every case as emotional as possible.

★ 0.0/10

Catch Him by All Means

S1:E6

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.

BaSsOo7 Jun 3, 2023

Typical Korean show. So melodramatic

★ 0.0/10

We Must Dig Deeper

S1:E7

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.

Snydez Jan 2, 2019

[spoiler]the reemergence of detective Cha is predictable [/spoiler] alas the story still go for maki...

★ 0.0/10

How Are You Alive?

S1:E8

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

phansy Feb 2, 2022

The best feel-good solved case so far.....

★ 0.0/10

Hongwon Dong Case

S1:E9

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.

★ 0.0/10

#10

Someone Has to Stop the Bad Guys

S1:E10

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.

BaSsOo7 Jun 9, 2023

It's crazy how nothing changes after 20 years in Korea.

★ 0.0/10

#11

The One Last Case

S1:E11

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.

celozzip Aug 15, 2024

I love how Lee went behind Parks's back and solved it. There's no way they could end it like that.

★ 0.0/10

#12

The Case Was Manipulated

S1:E12

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.

★ 0.0/10

#13

The Real Assailant

S1:E13

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.

Alantroll Oct 31, 2023

Way too much of a filler episode. The worst so far.

★ 0.0/10

#14

Not Now, But Maybe In The Past

S1:E14

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

★ 0.0/10

#15

Is It Really You?

S1:E15

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.

BaSsOo7 Jun 15, 2023

That transmission between Cha Soo Hyun and Lee Jae Han was kinda cringe? The dude was there talking ...

★ 0.0/10

#16

If You Don't Give Up

S1:E16

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

BaSsOo7 Jun 17, 2023

How did he escape the car attack? That wasn't told!!

★ 0.0/10

You're Doomed

S1:E1

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

BaSsOo7 May 29, 2023

That was like a movie in and of itself! Damn.

★ 0.0/10

We Still Have a Chance

S1:E2

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.

BaSsOo7 May 30, 2023

Finally, a time travel sci-fi that tackles the Bootstrap paradox.

★ 0.0/10

We Can Prevent the Killings

S1:E3

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.

BaSsOo7 May 31, 2023

I was gonna say, if they solved the case back then they shouldn't have been assigned the case now! B...

★ 0.0/10

We Found the Killer

S1:E4

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.

Snydez Jan 1, 2019

damn! tearjerker! ok, now the second part closed, ..

★ 0.0/10

Changing the Past Alters the Present

S1:E5

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

BaSsOo7 Jun 2, 2023

I like how they try to make every case as emotional as possible.

★ 0.0/10

Catch Him by All Means

S1:E6

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.

BaSsOo7 Jun 3, 2023

Typical Korean show. So melodramatic

★ 0.0/10

We Must Dig Deeper

S1:E7

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.

Snydez Jan 2, 2019

[spoiler]the reemergence of detective Cha is predictable [/spoiler] alas the story still go for maki...

★ 0.0/10

How Are You Alive?

S1:E8

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

phansy Feb 2, 2022

The best feel-good solved case so far.....

★ 0.0/10

Hongwon Dong Case

S1:E9

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.

★ 0.0/10

Someone Has to Stop the Bad Guys

S1:E10

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.

BaSsOo7 Jun 9, 2023

It's crazy how nothing changes after 20 years in Korea.

★ 0.0/10

The One Last Case

S1:E11

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.

celozzip Aug 15, 2024

I love how Lee went behind Parks's back and solved it. There's no way they could end it like that.

★ 0.0/10

The Case Was Manipulated

S1:E12

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.

★ 0.0/10

The Real Assailant

S1:E13

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.

Alantroll Oct 31, 2023

Way too much of a filler episode. The worst so far.

★ 0.0/10

Not Now, But Maybe In The Past

S1:E14

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

★ 0.0/10

Is It Really You?

S1:E15

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.

BaSsOo7 Jun 15, 2023

That transmission between Cha Soo Hyun and Lee Jae Han was kinda cringe? The dude was there talking ...

★ 0.0/10

If You Don't Give Up

S1:E16

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

BaSsOo7 Jun 17, 2023

How did he escape the car attack? That wasn't told!!

Season	Average Rating	Episodes	Best Episode	Worst Episode

Cast & Crew

View all 6 cast members and crew

Best Episodes Of Signal

Best Episodes Of Signal

Episode Ratings & Analysis

Best Episodes

Worst Episodes

You're Doomed

We Still Have a Chance

We Can Prevent the Killings

We Found the Killer

Changing the Past Alters the Present

Catch Him by All Means

We Must Dig Deeper

How Are You Alive?

Hongwon Dong Case

Someone Has to Stop the Bad Guys

The One Last Case

The Case Was Manipulated

The Real Assailant

Not Now, But Maybe In The Past

Is It Really You?

If You Don't Give Up

You're Doomed

We Still Have a Chance

We Can Prevent the Killings

We Found the Killer

Changing the Past Alters the Present

Catch Him by All Means

We Must Dig Deeper

How Are You Alive?

Hongwon Dong Case

Someone Has to Stop the Bad Guys

The One Last Case

The Case Was Manipulated

The Real Assailant

Not Now, But Maybe In The Past

Is It Really You?

If You Don't Give Up

Cast & Crew