In 1986, Park Gwang Ho works as an excellent and enthusiastic detective. His life changes when he’s pursuing leads in a serial homicide case and then passes through a time portal, which transports him to present day Seoul. He meets a new partner Kim Sun Jae, an elite detective who happens to be a bit eccentric, but is one highly skilled investigator. The detective duo will also find help in psychology professor,Shin Jae Yi.
(Source: Written by MyDramaList)
Native title: 터널
Also Known as: Teoneol
Screenwriters: Lee Eun Mi
Directors: Nam Ki Hoon, Shin Yong Hwi
Genres: Thriller, Psychological, Sci-Fi, Detective
Tags: Time Travel, Hwaseong Serial Murders
Country: South Korea
Type: Drama
Episodes: 16
Aired: Mar 25, 2017 - May 21, 2017
Aired On: Saturday, Sunday
Network: OCN
Duration: 60 min.
Score: 8.8 (scored by 4,495 users)
Ranked: #64
Popularity: #236
Rating: 15+ - Teens 15 or older
Cast & Credits
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Choi Jin Hyuk
Park Gwang Ho
Main Role

Yoon Hyun Min
Kim Seon Jae
Main Role

Lee Yoo Young
Shin Jae Yi
Main Role

Jo Hee Bong
Jun Sung Shik
Support Role

Kim Min Sang
Mok Jin Woo
Support Role

Noh Tae Yeob
Mok Jin Woo [Young]
Support Role