Signal 2016

Park Hae-young (played by Lee Di-hoon), a criminal policeman of the mystery search team, is a police heretic who is dissatisfied and distrustful of the police. In order to make ends meet, Haeyoung wasted her talents investigating celebrity privacy and then selling it to the media until a 10-year-old radio sounded. And the criminal policeman Lee Jae-han (played by Cho Jin-woong), who was active in the police in the 80s, is an upright man who can't be clever and can only rush forward, and Chae-han uses a wireless machine to contact Hae-young and begin to solve the unsolved events of the past.