SIGNAL Korean Drama - TV Series DVD * Subtitles: Chinese/ English * Language Option 1: Korean * Language Option 2: Mandarin * Release Year: 2017 * Run Time: 1280 Mins * No. of Episodes: 16 * No. of Discs: 4 * Director: Kim Won-seok * Actor: Lee Je Hoon, Kim Hye Soo * Synopsis: Park Hae Young (Lee Je Hoon) is a police lieutenant who is an expert criminal profiler. Hae Young went into police work despite his deep-rooted mistrust of cops stemming from a traumatic event from his childhood. When he was young, his friend Yoon Jung was kidnapped and later found dead. Hae Young saw a woman pick up Yoon Jung from school on the day that she went missing, but the police would not believe Hae Young and stated that a man took her. The case remains unsolved to this day. Now working at the same police station where Hae Young tried to get the cops to believe him as a child, Hae Young walks out of the station one day and hears someone talking to him. He searches around and finds a walkie-talkie with the voice of police detective Lee Jae Han (Cho Jin Woong) talking to him. But Jae Han is from decades into the past, and he is investigating the murder of Hae Young’s friend Yoon Jung. Cha Soo Hyun (Kim Hye Soo) was a rookie during Jae Han’s time and is now an experienced police detective. Can this unexpected trio help each other solve cold cases from the past by communicating through the walkie-talkie?