Signal

Signal is a 2016 South Korean fantasy police procedural television series starring Lee Je-hoon, Kim Hye-soo, and Cho Jin-woong. Based on the 2000 film Frequency in premise and inspired by real-life criminal incidents in Korea, including the Hwaseong serial murders, the series aired on tvN from January 22 to March 12, 2016 on Fridays and Saturdays at 20:30 KST for 16 episodes. The series received widespread acclaim from audiences and critics alike for its story and performances. It is also one of the highest-rated Korean dramas in cable television history with a peak audience viewership of 12.544%. Storyline Criminal profiler Park Hae-young (Lee Je-hoon) solves a kidnapping case involving a culprit who apparently disappeared after the crime with a mysterious walkie-talkie he picks up. The success of this case triggers the formation of a long-term cold case team, led by Det. Cha Soo-hyun (Kim Hye-soo), who has searched for her long-lost mentor, Det. Lee Jae-han (Cho Jin-woong), over the past 15 years. With the help of Jae-han, the person at the other end of the walkie-talkie, Hae-young solves other cold cases that had remained unsolved for years while also helping Jae-han help solve other cases. Unintended consequences due to the changes in the past follow. Cast