Miss Night and Day
🎬 JTBC · Netflix
⭐ 8.2 / 10 MDL 🔞 15+
📋 Drama Overview
Everything you need to know before you hit play.
Somewhere around minute ten of the pilot, Lee Mi-jin (Jung Eun-ji) falls into a well chasing a stray cat and climbs out thirty years older. Miss Night and Day never bothers explaining the mechanics of the swap — one minute she’s an unemployed twenty-something who’s failed her umpteenth civil service exam, the next she’s a woman in her fifties with a lifetime of invented experience to put on a resume. She turns the curse into a resume line, walks into the Seohan District Prosecutors’ Office as “Im Sun,” and gets the internship her younger self could never land.
Gye Ji-ung (Choi Jin-hyuk), the prosecutor she’s assigned to, is working a twenty-year-old missing persons case that turns out to be tangled up with his own mother’s unsolved murder — and Im Sun, without meaning to, keeps turning up holding pieces of it. The show splits its runtime between office comedy, a genuine serial-killer investigation, and a romance that has to reckon with the fact that its heroine is, biologically speaking, two different women. It shouldn’t work. It mostly does.
16 / 16 ✅ Completed
⚡ Quick Verdict
One box. Everything you need to decide.
· MDL Score · 20,649 ratings
▶ Official Trailer
🎭 Cast & Characters
A JTBC office comedy that hides a genuine serial-killer case in its filing cabinets.
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📺 Episode Guide
Spoiler-light recaps — enough to remember where you left off, nothing that ruins the ride.
🏁 Ending Explained
Full spoilers ahead — everything that happens in the finale and what it all means.
Spoiler Warning — This section covers the full finale of Miss Night and Day. Stop here if you haven’t finished the series.
What actually happened Kwak Geum-hwa — the serial killer hiding for over a year in plain sight as intern Na Ok-hui — is exposed, cornered, and arrested after kidnapping Mi-jin’s father to lure Mi-jin into a final trap. Ji-ung tracks Mi-jin’s phone to reach her in time, the standoff resolves without another death, and Mi-jin testifies to close out both the current case and the twenty-year-old disappearances tied to Ji-ung’s mother. The raincoat killer, the missing bank employee, and Ji-ung’s oldest unsolved case all turn out to be the same woman’s work.
What happened to the real Im Sun The blood test discrepancy Mi-jin uncovers back in episode 9 gets its answer here: the actual Im Sun, the aunt whose name and bank-employee history Mi-jin borrowed, was one of Geum-hwa’s earlier victims, connected to Baek Cheol-gyu through the same web the show has been tracing since the raincoat killer’s first scene. Mi-jin spent sixteen episodes literally wearing a dead woman’s identity without knowing it — the show doesn’t dwell on that horror for long, but it’s there.
Why the transformation stops mattering The show never explains the mechanics of Mi-jin’s age-swap, and by the finale it doesn’t need to. The moment that actually resolves the premise isn’t a cure — it’s Ji-ung watching Mi-jin change from fifty back to twenty-something right in front of him and choosing to stay anyway. Once the person who matters most stops flinching at the transformation, the gimmick quietly stops being a plot problem and becomes just another fact about who Mi-jin is.
Ko Won’s quiet exit Ko Won spends most of the back half knowing Mi-jin’s secret and choosing to protect it without ever cashing that in for a real shot at her. The finale doesn’t force a love triangle resolution because there was never really a triangle — just a friend who happened to fall for both halves of the same woman and had to make peace with only one of them being available.
The KDW verdict Miss Night and Day ends by refusing to treat Mi-jin’s two identities as a problem that needed solving in the first place. She keeps the internship, keeps the relationship, and keeps switching faces every sunset — the difference is that by episode 16, nobody in her life, including her, is trying to talk her out of any version of herself. For a show that opened as a fantasy gag, that’s a genuinely earned place to land.
✍️ KDramaWorlds Editor’s Take
Our honest read on why this drama is worth your time — and who it’s for.
⚖️ Prosecutor’s Intern
👵 Two Faces, One Heart
🔪 Serial Killer Subplot
Jung Eun-ji and Lee Jung-eun are technically playing the same person, and the show trusts them to make that believable without ever explaining how a twenty-something and a woman thirty years her senior share one soul. It works because neither actress plays the role as a costume change — Lee Jung-eun’s Im Sun carries herself like someone who has actually failed a hundred job interviews and finally stopped caring what anyone thinks of her, and that specific confidence is what gets her through doors Mi-jin’s anxious twenty-something self would never survive. Miss Night and Day isn’t the first K-drama to hide a serious woman inside a comedic premise — Undercover Miss Hong runs a similar bait-and-switch with its lead, but it commits harder to the bit by making the two ages functionally different people with different instincts, not just different wardrobes.
Choi Jin-hyuk’s Gye Ji-ung could have been a stock overworked prosecutor with a tragic backstory, and for stretches of the mystery plot he basically is. What saves him is how specifically the show writes his blind spots — he interrogates Im Sun about her uncanny knack for showing up at crime scenes for six straight episodes without once suspecting the actual, much stranger truth, because the strange truth is stranger than anything in his job description. Prosecutor dramas usually treat the badge as the character; Bad Prosecutor does something similar with a lead who has to unlearn his own instincts, and both shows are more interesting for making the job a flaw before it’s a strength.
The serial-killer plot is the part of Miss Night and Day that shouldn’t survive next to the workplace comedy, and for thirteen episodes it mostly doesn’t have to — it stays in the background, humming along under the jokes about pension plans and unpaid internships. Then Kwak Geum-hwa steps forward as an actual person with an actual motive, and the show has to decide, fast, whether its comedy engine can carry real stakes. It mostly can, if you’re willing to forgive some tonal whiplash in the last three episodes.
Fans of workplace mysteries where the intern is smarter than everyone in the room
Viewers who like their romance with an actual mystery attached, not just a meet-cute
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