- Drama: Tunnel (working title)
- Revised romanization: Teoneol
- Hangul: 터널
- Writer: Lee Eun-Mi
- Network: OCN
- Release Date: March 18, 2017 --
- Runtime: Sat. & Sun. 22:00
- Language: Korean
- Country: South Korea
In 1986, Park Gwang-Ho works an excellent and enthusiastic detective. To save his daughter, he travels in time to the present day.
- "Tunnel" takes over the OCN Sat. & Sun. 22:00 time slot previously occupied by "Voice" and will be followed by "Dual" May, 2017.
- Filming begins in late December, 2016.
- First script reading took place December, 2016 at CJ E&M Center in Sangam-dong, Seoul, South Korea.
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