Movies like Guardian: The Lonely and Great God

Why it's similar — Mystic Falls and Incheon are working the same supernatural-romance genre in different idioms — an immortal man and the young human woman whose lifespan he has to negotiate with — and both shows are built around the same hard question: what does loving an immortal cost the mortal who decides to do it. The CW series gives Guardian its closest English-language tonal cousin.

Why it's similar — Sam and Dean's American-folk-horror road show shares Guardian's comic-cohabitation register: two non-human or barely-human men whose long-running argument is also the show's love story. Both series treat their cosmologies — Reapers, household deities, prior lives — as the texture rather than the obstacle, which is why their domestic scenes carry as much weight as their set-pieces.

Why it's similar — Both K-dramas use a metaphysical reset — a sword in the chest in one, a second life in the other — as the engine to ask what choice the heroine would make if she had perfect information about the man in front of her. Guardian's nine-hundred-year backstory and Marry My Husband's reborn-into-yesterday premise are versions of the same trick: history as a writable draft.

Why it's similar — Park Hye-ryun's courtroom-fantasy melodrama has Guardian's exact tonal fingerprint: a contemporary Seoul romance with one fantastical premise — Park's hero can hear thoughts; Kim Eun-sook's hero is immortal — and a script that takes the premise's emotional weight seriously while still letting the leads be funny in a coffee shop.

Why it's similar — Death's Game is the second-generation of Guardian's central conceit: a fantastical bureaucracy of the afterlife, a human protagonist forced to negotiate with it, and a Reaper-coded administrator whose job is harder than the cosmology lets on. Where Guardian runs the romance long, Death's Game runs the bureaucracy hot — same world, different verb.