Dramas like
Tunnel

The obvious pairing, and the better plotted of the two. A walkie-talkie connects a profiler to a detective twenty years back, cold cases get solved across the gap, and the time rules stay consistent for sixteen episodes. Same idea that a crime unsolved in one decade is somebody's whole life in the next. Difference: it is far colder and sadder, and it asks a great deal more of you than Tunnel ever does.

Hooks early Episode 1. The walkie-talkie premise is set up and paid off inside the first hour.

The same displacement, pointed the other way. A modern profiler wakes up in 1988 and has to solve murders with none of his forensics, which is Tunnel's premise reversed exactly. Same interest in old policing as a method rather than a joke. Difference: it is psychological and ambiguous where Tunnel is warm and procedural, and it never fully tells you what happened to him.

Hooks early Episode 2, once the 1988 precinct stops being a joke to him and starts being a place.

Serial murder handled as work, not as spectacle. Korea's first criminal profiler, twelve episodes of interviews, and the discipline to make the method itself the tension. Same respect for the investigators as craftsmen. Difference: no fantasy device, no comedy and no partnership warmth, so it is a considerably harder sit.

Hooks early Episode 2, once the first interview subject starts talking and the method becomes visible.

If you want the same hunt with the floor removed. A serial killer thriller that ties its chase to the question of what makes one, with an 8.9 across twenty episodes and per-episode scores that never drop below 8.4. Same rhythm of a case that keeps reframing itself. Difference: it is genuinely brutal, its argument about where cruelty comes from is nastier than it needs to be, and there is no relief in it anywhere.

Hooks early Episode 2, once the killer and the two men chasing him are locked into the same story.

Same writer, modern kit. Lee Eun Mi again on a profiler who is the prime suspect in her own uncle's murder, with the puzzle cards arriving from episode one. Same construction of a case that takes years to unwind. Difference: eleven episodes, no time travel, and the puzzle cards are the hook rather than the answer.

Hooks early Episode 1. A profiler is the prime suspect in her own uncle's murder, and the puzzle cards start arriving immediately.

The coldest, smartest version of a Korean investigation. A prosecutor who feels almost nothing and a detective who feels everything, working a conspiracy the script refuses to recap for you. Same demand that you keep the whole board in your head. Difference: no supernatural element, no comedy, and the institution never changes, which Tunnel is much more optimistic about.

Hooks early Episode 2, once the first autopsy contradicts the official story.