Tunnel

When mysterious murders involving only women occur, Detective Kwang-ho takes the case.

Kwang-ho finds himself 30 years in the future, and Korea's first female serial killer is found dead.

A 5th victim is found 30 years later as Kwang-ho looks for a link between the past and present.

A fire erupts in the apartment below Kwang-ho, and Chief Sung-shik becomes suspiciuos.

A victim marked with the 7th dot appears as Seon-jae is desperate to catch the killer.

1958-born Kwang-ho chases 1988-born Kwang-ho to find his way back to his own time.