In the thrilling Korean series, Signal, a profiler from 2015 and a detective from 1989 join forces through a mysterious walkie-talkie to solve crimes that have gone unsolved for decades. As they work together, they not only bring justice to victims but also alter the course of events, causing unexpected consequences. With a unique blend of sci-fi and crime genres, Signal takes viewers on a gripping journey through time, where the past and present collide in a race against time to uncover the truth.

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Some TV shows that have similar genres and were produced around the same time as Signal include Dark, The X-Files, Forever, Cleverman, Penny Dreadful: City of Angels, Green Frontier.