In 1986, Detective Park Gwang Ho, married to Sin Yeon Suk, is relentlessly pursuing a serial killer. While chasing the suspect through a tunnel, Gwang Ho is inexplicably transported to 2017. There, he meets Kim Seon Jae, an eccentric yet skilled detective, and Sin Jae Yi, a professor of criminal psychology. Together, they join forces to catch the killer who has resumed the same crime spree that began 30 years ago.
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