Tunnel is about a hot headed detective of Serious Crimes Unit, Kwang Ho, gains consciousness after getting assaulted while chasing down a serial killer. When he wakes up, he realises that he’s been sent 30 years into the future where the case has been closed due to the lack of progress. Desperate to catch the culprit, he teams up with Sun Jae and Jae Yi, homicide detective and psychology professor living in the year of 2016.
- Drama: Tunnel
- Revised romanization: Teoneol
- Hangul: 터널
- Director: Shin Yong-Whee, Nam Ki-Hoon
- Writer: Lee Eun-Mi
- Network: OCN
- Episodes: 16
- Release Date: March 25 – May 21, 2017
- Runtime: Sat. & Sun. 22:00
In 1986, Detective Park Gwang-Ho (Choi Jin-Hyuk) desperately tries to catch a serial killer. He chases after the serial killer and goes through a tunnel. On the other side of the tunnel, Detective Park Gwang-Ho finds himself in the year 2017. The serial killer has resumed the killings that began 30 years ago. Detective Park Gwang-Ho works with Detective Kim Sun-Jae (Yoon Hyun-Min) and Professor of Criminal Psychology Shin Jae-Yi (Lee Yoo-Young) to catch the killer.
- Tunnel Torrent Files takes over the OCN Sat. & Sun. 22:00 time slot previously occupied by “Voice” and followed by “Duel” on June 3, 2017.