Tunnel is a fantasy-thriller web television series. Korea made this web television series. The focused character of this series is a detective. He goes into the past and present in the hopes of saving his daughter. He goes from walking along the weirs of rice paddies for clues in 1986. This story is very mysterious and thrilling. It is a highly rated series. Season 1 of this series premiered on March 25, 2017, and ended in the same year, May 21, 2017. Till now, a total of 1 season and 16 episodes are published.