"Tunnel" is a time-travel drama, mainly about a policeman who travels from the past (1986) to the present (2016) to save his daughter. He runs wild in every place he goes. The drama will show the rustic drifting story of a male policeman in the past. This drama is written by Lee Eun-mi, the screenwriter of the one-act play "The Uninvited Guest", and will premiere in March 2017, following the voice show.