- Title: 터널 / Teoneol
- Genre: Detective, crime, thriller, fantasy
- Episodes: 16
- Broadcast network: OCN
- Broadcast period: 2017-Mar-25 to 2017-???-??
- Air time: Saturday & Sunday 22:00
- Original Soundtrack: Tunnel OST
A police detective from 1986 travels in time to the present to save his daughter.
- Main Cast
- Task Force Team 1
- Lee Shi Ah as Shin Yun Suk (Kwang Ho's wife)
- Kim Min Sang as Mok Jin Woo (Coroner)
- Joo Ho as Reporter Oh
- N as Park Gwang Ho
- Directors: Shin Yong Hwi (신용휘), Kim Kyung Chul (김경철), Kim Sung Min (김성민)
- Screenwriter: Lee Eun Mi (이은미)
- Filming began in late December, 2016.
- For personal reason, director Kim Kyung Chul was replaced by Shin Yong Hwi, which started began filming from March.