Signal

Name: Signal
Genre: Crime, Thriller
Released: 2016-01-22
Rating: 8.5
Cast: Kim Hye-soo, Lee Je-hoon, Cho Jin-woong, Jeong Hae-gyun, Kim Won-hae

IMDB: 8.5 2 Seasons

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