A detective travels to the future to solve a serial murder case in the OCN crime thriller Tunnel, an exciting drama inspired by the infamous Hwaseong serial murders that occurred between 1986 and 1991. Choi Jin Hyuk (Pride and Prejudice) takes the lead role of a detective who cracks murder cases with Yoon Hyun Min (My Daughter, Geum Sa Wol) and Lee Yoo Young (The Treacherous). VIXX's N (Cheer Up!) co-stars as a young cop who holds the key to the secret of time travel.
Detective Park Kwang Ho (Choi Jin Hyuk) is investigating a series of mysterious killings targeting women. One night, he discovers the murderer inside a tunnel but gets hit on the head and loses consciousness. When he wakes up, he finds himself in the year 2016. He takes on the identity of a young police officer with the same name and continues to track down the culprit with his partner Kim Sun Jae (Yoon Hyun Min) and criminal psychologist Shin Jae Yi (Lee Yoo Young).