Television series
Signal
Signal is a cold-case thriller wearing a ghost story's clothes: a burnt-out present-day detective and a doggedly principled cop from 1989 trade clues over a crackling walkie-talkie, racing to save people history already killed. Part serial-killer procedural, part elegy for institutional rot, held together by an aching, wordless partnership. Gripping and melancholic — for anyone who wants their mystery to actually hurt.
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Memories of Murder2003
Bong Joon-ho's masterpiece and basically the film that wrote Signal's tone: two mismatched detectives, a serial killer never caught, rural Korea soaked in rain and futility. Essential viewing.
But No time-travel device and no comforting answers — it's rooted in a real unsolved case, and the ending offers no relief at all.
The Time Tunnel1966no page yet
The Korean drama that plays Signal's exact premise from another angle: a detective is flung thirty years forward, forced to solve his own cold case alongside a younger version of his squad.
But Broader and occasionally comic where Signal stays grim — the swings between farce and real grief won't land for everyone.
Life on Mars2006
Long before Signal, a British detective woke up in 1973 and had to solve crimes alongside colleagues who might be figments of a coma. Same ache of talking across time to people you can't quite save.
But Leans harder into ambiguity about what's even real, and its seventies cop-show pastiche is broader and funnier than Signal's chill.
The wildcard
Something you would not have found on your own.
Frequency2000
Same engine, sixteen years earlier: a ham radio instead of a walkie-talkie lets a son talk to his dead father across time, and together they try to stop a serial killer from claiming more victims. It's Signal's premise in a Hollywood coat.
Proof this idea works without prestige-drama polish — warm, twisty, and unashamedly emotional about a father and son instead of partners and colleagues.
But American, sentimental, and very much a 2000s studio picture — glossier and morally simpler than Signal.
More like this (8)
True Detective2014
Two timelines, one unsolved case, and detectives quietly destroyed by chasing something bigger than themselves — the slow-burn obsession that makes Signal's cops feel so worn down.
But No supernatural or cross-time device, just linear dread, and its swampy nihilism is if anything even bleaker.
MINDHUNTER2017
Swap walkie-talkies for tape recorders: FBI agents interview serial killers to understand what the system keeps missing. Same fascination with institutional failure and the cost of chasing monsters.
But Cerebral and procedural rather than personal — you get cold analysis instead of Signal's aching cross-time partnership.
Stranger2017no page yet
An emotionless prosecutor and a warm-hearted detective untangle corruption that goes all the way to the top — Signal's institutional rot, dialed up into full conspiracy.
But Colder and more procedural than Signal, with a puzzle-box plot that demands real patience to pay off.
Voice2017no page yet
A profiler who can hear anything through a phone line hunts killers case by case — a pacier, pulpier cousin to Signal's slow-burn mystery, from the same crime-thriller ecosystem.
But More monster-of-the-week than serialized mystery, and considerably trashier — fun, but not the same melancholy itch.
Broadchurch2013
A single murder rips a small seaside town apart and turns everyone into a suspect. Same commitment to grief as an engine, not just a plot beat.
But One case, one town, no time-crossing structure — a much smaller, sadder story than Signal's decades-spanning canvas.
The Killing2011
The original Nordic noir: a detective who won't let go of a case long after everyone tells her to. That same stubborn, lonely devotion Signal gives its cops.
But Slower and colder, with none of Signal's genre hook — just patient, wintry, unglamorous police work.
Boku Dake ga Inai Machi2017
Swap the walkie-talkie for an unexplained power that yanks a man back in time whenever someone near him is about to die — the same moral vertigo of trying to save people you've already failed once.
A devastating, gorgeously animated meditation on guilt and second chances, wrapped around a child-murder mystery that hits far harder than the premise suggests.
But It's anime, which some rule out on principle, and its register is softer and more melancholic than propulsive.
The Keepers2017
No fiction, no time travel — just two elderly women, decades later, refusing to let a 1969 murder and the abuse it covered up stay buried, echoing Signal's fury at institutions that protect themselves over victims.
A true story angrier and sadder than any drama could invent, and a reminder that Signal's fictional cover-ups are pulled straight from life.
But It's real, it concerns the abuse of children, and it offers no neat resolution — considerably heavier going than Signal at its darkest.
People
Cast
Production
- Lee Jae MoonProducer
Recommended by
The Girl Who Leapt Through Time, Oops! Mysterious Sounds, Boku Dake ga Inai Machi