

10.070 minSeason 1 • Episode 16
LatestA police detective from 1986 travels in time to the present to save his daughter.
Acting
Choi Jin-hyuk sells 1986 machismo crashing into modern sensitivity.
Writing
Time travel rules that actually hold up for 16 episodes.
Production
Period detail so precise you'll miss the rotary phones.
Trivia, insights & behind the scenes
Based on real Hwaseong serial murders that haunted Korea for decades — the case was solved in 2019, two years after this aired.
Choi Jin-hyuk did his own tunnel stunts and reportedly refused a stunt double for the 1986-to-2016 transition scene.