Guardian: The Lonely and Great God: Plot, Cast, Ending & Where to Watch

Gong Yoo

Gong Yoo plays Kim Shin as a man whose grief has had nine hundred years to settle into something close to manners. The performance's tell is the way he listens — pre-modern stillness over a contemporary face — and the way he lets Eun-tak's teenage cheerfulness pull him slightly off-balance scene by scene. His comic timing with the Reaper is the show's pleasure; his late-episode scenes with the boy-king flashback are the show's argument.

Kim Go-eun

Kim Go-eun's Eun-tak is the show's emotional engine: a high-schooler who has been doing her own grocery shopping since her mother died and who refuses, on principle, to be saved without arguing the terms. The performance keeps the romance grounded by treating Kim Shin first as a roommate, then as a problem, then as a person — never as the genre's standard fantasy boyfriend.

Lee Dong-wook

Lee Dong-wook gives the Reaper two performances at once: a deadpan civil servant whose every interaction with the living is conducted at one remove, and — once the past-life reveal lands — a former king who has been doing penance for the murder of a friend he no longer remembers. The shift across the final third of the series is one of the cleanest pieces of acting in Kim Eun-sook's whole catalogue.

Yoo In-na

Yoo In-na's Sunny runs a small chicken-and-tea shop with the easy authority of a woman who has decided not to spend her one life waiting on a man. The performance pulls double duty: present-tense romance with the Reaper plays as flirtation and slow exasperation; past-tense flashback hands her the show's most operatic register without losing the contemporary woman she has built underneath it.

Yook Sung-jae

Yook Sung-jae plays Deok-hwa as the show's most contemporary character by a margin of nine centuries: a wealthy young heir who treats two cohabiting immortals as his uncles, his housemates, and his most exhausting roommates. The comic timing is critical to the show's tonal balance, and the late-episode reveal about his role inside the household's cosmology is paid off precisely because Yook plays the early episodes so unselfconsciously.

Lee El

Lee El's Sam-shin — the household-grandmother goddess of childbirth dressed in scarlet — is the show's most direct line back into Korean folk cosmology. She is not a comic relief role and not a fairy-godmother role: Lee plays her as a divinity with millennia of opinions, occasionally inconvenienced by having to phrase those opinions in twenty-first-century Seoul. Her scenes with Eun-tak are the show's quiet thesis about who watches over girls whose mothers have died.