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

Show Info

Airs on: Korea, Republic of tvN (2016 - now)
Schedule: Fridays, Saturdays at 20:30 (75 min)
Status: Running; returning 2018
Language: Korean
Show Type: Scripted
Genres: Crime Thriller Mystery
Episodes ordered: 16 episodes

Official site:

8.6 (10 votes)

Previous Episode

Episode 16

Episode 1x16; Mar 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.

Previous Episodes

Episode NameAirdateTrailer
1x16: Episode 16Mar 12, 2016
1x15: Episode 15Mar 11, 2016
1x14: Episode 14Mar 5, 2016
View full episode list »


Extra Details

Also known as:
  • Sigeuneol (Korea, Republic of Korea, Republic of)
  • 시그널 (Korea, Republic of Korea, Republic of)
  • Shigeunul (Korea, Republic of Korea, Republic of)
View all AKAs »