A walkie-talkie in the present somehow picks up signals from a detective in the past, Lee Jae Han (Jo Jin Woong). Police profiler Park Hae Young (Lee Je Hoon) finds this walkie-talkie and uses it to help solve cold cases. Detective Cha Soo Hyun (Kim Hye Soo), who was once a rookie at Lee Jae Han’s station, leads the cold-case team. Thanks to Park Hae Young (and Lee Jae Han), the team solves infamous cold cases, such as the “Hwaseong serial murders (1986-1991)”. But communicating with the past has consequences.
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