Top 9 in Top 10 detective Kdramas you must watch once in your life.
Trailer Tunnel
In 1986, detective Park Gwang-ho tried to catch a serial killer and ran into a tunnel while chasing the criminal. At the end of the tunnel, he finds himself mysteriously transported to the year 2017. While there, he teams up with Detective Kim Sun-jae and criminal psychologist Shin Jae-yi to arrested the same suspect who continued to kill people 30 years later.
Main actors: Choi Jin Hyuk, Yoon Hyun Min, Lee Yoo Young