Detective Park Gwang-ho, who is trying to catch a serial killer in 1986, accidentally passes through a tunnel and comes to 2016, where he meets detective Kim Sun-jae and psychologist Shin Jae-yi.
Premiere: 21 May
On Air: Every Mon & Tue 23:00 (GMT+8)
1 hr per episode per day
Cast: Choi Jin-hyuk, Yoon Hyun-min, Lee Yoo-young