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.
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