The BEST episodes of Signal

Every episode of Signal ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Signal!

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

Last Updated: 1/16/2023Network:tvN
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Not Now, but Maybe in the Past
star
9.04
74 votes

#1 - Not Now, but Maybe in the Past

Season 1 - Episode 14 - Aired 3/5/2016

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.

Directors: Kim Won-suk
Is It Really You?
star
8.97
73 votes

#2 - Is It Really You?

Season 1 - Episode 15 - Aired 3/11/2016

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.

Directors: Kim Won-suk
Watch Now:Amazon
We Found the Killer
star
8.93
86 votes

#3 - We Found the Killer

Season 1 - Episode 4 - Aired 1/30/2016

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

Directors: Kim Won-suk
Watch Now:AmazoniTunes
If You Don't Give Up
star
8.93
82 votes

#4 - If You Don't Give Up

Season 1 - Episode 16 - Aired 3/12/2016

Lee Jae Han is set on bringing down Kim Bum Joo, despite knowing that he's going to die, but a certain transmission is about to make all the difference.

Directors: Kim Won-suk
Watch Now:Amazon
How Are You Alive?
star
8.89
76 votes

#5 - How Are You Alive?

Season 1 - Episode 8 - Aired 2/13/2016

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

Directors: Kim Won-suk
Watch Now:iTunes
The Real Assailant
star
8.89
73 votes

#6 - The Real Assailant

Season 1 - Episode 13 - Aired 3/4/2016

The Cold Case Squad secretly reinvestigates the Injoo gang rape case. Lee Jae Han finds out the connection Park Hae Young has to the case.

Directors: Kim Won-suk
Watch Now:AmazoniTunes
The One Last Case
star
8.88
76 votes

#7 - The One Last Case

Season 1 - Episode 11 - Aired 2/26/2016

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

Directors: Kim Won-suk
Watch Now:AmazoniTunes
The Case Was Manipulated
star
8.84
74 votes

#8 - The Case Was Manipulated

Season 1 - Episode 12 - Aired 2/27/2016

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.

Directors: Kim Won-suk
Hongwon Dong Case
star
8.80
74 votes

#9 - Hongwon Dong Case

Season 1 - Episode 9 - Aired 2/19/2016

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

Directors: Kim Won-suk
Watch Now:Amazon
You're Doomed
star
8.75
102 votes

#10 - You're Doomed

Season 1 - Episode 1 - Aired 1/22/2016

Haunted by a classmate's kidnapping 15 years ago, Park Hae Young becomes a police profiler who's lost faith in the police force. This all changes when he stumbles upon an old radio that's receiving transmissions from the past.

Directors: Kim Won-suk
Watch Now:iTunes
We Can Prevent the Killings
star
8.73
88 votes

#11 - We Can Prevent the Killings

Season 1 - Episode 3 - Aired 1/29/2016

During the investigation of the serial murders, Park Hae Young discovers that the radio transmissions are actually connecting him to the past.

Directors: Kim Won-suk
Watch Now:iTunes
Catch Him by All Means
star
8.72
75 votes

#12 - Catch Him by All Means

Season 1 - Episode 6 - Aired 2/6/2016

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

Directors: Kim Won-suk
Watch Now:iTunes
Someone Has to Stop the Bad Guys
star
8.71
75 votes

#13 - Someone Has to Stop the Bad Guys

Season 1 - Episode 10 - Aired 2/20/2016

The Cold Case Squad is assigned to the serial murder, but the last the victims isn't identified. Cha Soo Hyun revisits a past trauma.

Directors: Kim Won-suk
Changing the Past Alters the Present
star
8.64
76 votes

#14 - Changing the Past Alters the Present

Season 1 - Episode 5 - Aired 2/5/2016

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.

Directors: Kim Won-suk
Watch Now:iTunes
We Still Have a Chance
star
8.63
98 votes

#15 - We Still Have a Chance

Season 1 - Episode 2 - Aired 1/23/2016

After the Kim Yoon Jung kidnapping case, the Chief of police creates a cold case squad. Their first case is the infamous Gyeonggi Nambu serial murders.

Directors: Kim Won-suk
Watch Now:iTunes
We Must Dig Deeper
star
8.58
74 votes

#16 - We Must Dig Deeper

Season 1 - Episode 7 - Aired 2/12/2016

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

Directors: Kim Won-suk
Watch Now:iTunes

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