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2016·Crime·17 episodes
8.1
★

Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
Created by Kim Eun-hee and Kim Won-suk
corruption
investigation
murder
tragic past
signal
changing the past or future
butterfly effect
dark
suspense
thriller
awestruck
YouTube
Trailer
IMDB
IMDB
N/A
Where to Watch
NetflixAmazon Prime Video

Seasons

Season 1
Season 1
16 episodes · 2016
Season 2
1 episode

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

Crew

Kim Eun-hee
Kim Eun-hee
Creator
Kim Won-suk
Kim Won-suk
Creator
Park Seong-il
Park Seong-il
Original Music Composer

Popular Reviews

54 reviews
thegeekyindian
thegeekyindian
9.0★ · 07/01/26
Signal
Why is the story not completed? And why is there no S2 in last 10 years?
Why is the story not completed? And why is there no S2 in last 10 years?
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マサル
マサル
10.0★ · 08/24/25
Signal
Bu introyu asla unutamayacağım
Bu introyu asla unutamayacağım
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abel
abel
10.0★ · 03/13/25
Signal
every rewatch just reminds me why this drama is so damn good
every rewatch just reminds me why this drama is so damn good
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hura
hura
10.0★ · 02/04/25
Signal
SEDIH BANGET CUYY PLS BUTUH S2
SEDIH BANGET CUYY PLS BUTUH S2
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Fairuz
Fairuz
9.0★ · 01/04/25
Signal
polisi di mana aja sama-sama korup, ya.
polisi di mana aja sama-sama korup, ya.
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