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Tunnel
Similar to the Korean Signal drama, the Korean drama Criminal Tunnel also contains elements of sci-fi! The difference is in the Korean drama Tunnel, the main character, Park Kwang Ho is able to become a time travel.
His ability to do time travel is supported by his desire to find a serial killer who always kills his victims in the same way. How are you more curious?
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I loved Signal, so I think I'll enjoy Criminal Tunnel!