Tunnel

In 1986, Park Gwang-ho works as a successful detective in an enthusiastic manner. However, his life changes when he takes the lead in a serial homicide case and when he passes through a tunnel while chasing the "culprit". He time travels 30 years into the future (2016), where he meets a new partner, Kim Seon-jae, an eccentric elite detective that has a high ability in investigation. When the serial killer continues his "modis operandi" of his murders that happened 30 years ago, the detective duo works together with a Criminal psychologist, Professor Shin Jae-yi to solve the unsolved murders and to catch the murderer. [About:] Tunnel is a 2017 South Korean television series starring Choi Jin-hyuk, Yoon Hyun-min and Lee Yoo-young. It replaced Voice and aired on cable network OCN on Saturdays and Sundays in the 22:00 (KST) time slot from March 25 to May 21, 2017 for 16 episodes. The series was inspired by the Hwaseong serial murders. The series was a hit in China. It received a Thai remake in 2019, and an Indonesian remake was announced in 2020. [Source: Wikipedia]