Park Hae Yeong, who was a student in elementary school at the time, saw a young girl being abducted on her way home from school fifteen years ago.The girl was discovered dead a few days later, but the authorities were unable to identify the killer. Hae Yeong eventually developed a mistrust for the police.

Hae Yeong is currently a police officer and criminal profiler after fifteen years. He comes across a walkie-talkie one day, which enables him to communicate with Detective Lee Jae Han who is in the past. Afterwards, in an effort to investigate unsolved crimes, police officers Cha So Hyun, Hae Yeong, and Jae Han set out on a voyage.

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