My Perfect Stranger

One box. Everything you need to decide.

Kim Dong-wook and Jin Ki-joo lead a cast that makes 1987 feel genuinely inhabited rather than costumed.

Kim Dong-wook

Yoon Hae-jun

Lead

Jin Ki-joo

Baek Yoon-young

Lead

Seo Ji-hye

Lee Soon-ae

Supporting

Lee Won-jeong

Baek Hee-sub

Supporting

Kim Jong-soo

Yoon Byung-gu

Supporting

Park Soo-young

Lee Hyung-man

Supporting

Lee Gyu-hoe

Baek Hee-sub (2021)

Supporting

Kim Jung-young

Park Ok-ja

Supporting

Lee Ji-hyeon

Lee Soon-ae (2021)

Supporting

Choi Young-woo

Baek Dong-sik

Supporting

Jeong Ga-hee

Lee Joo-young

Supporting

Jeong Sin-hye

Lee Chung-ah

Supporting

Spoiler-light recaps — enough to remember where you left off, nothing that ruins the ride.

EP 01

Arrival in 1987

May 1, 2023

Two strangers land in 1987 the way most life-changing things happen — sideways and without explanation. Hae Jun arrives carrying a crime he came to prevent. Yun Yeong arrives carrying a plan to undo her own existence. Neither bothers to tell the other why they’re there. The drama’s first act of intelligence is making both missions feel equally reasonable, and equally doomed.

EP 02

Strangers in a Strange Time

May 2, 2023

The episode where both of them realize that being in the past isn’t the same as understanding it. Yun Yeong’s first actual encounter with the teenage version of her mother is disorienting the way mirrors are — the person you thought you knew, from an angle you’ve never seen before. She came here to erase a story. She’s about to discover she doesn’t know it as well as she thought.

EP 03

The First Murder

May 8, 2023

Foreknowledge turns out to be overrated. Hae Jun knows a murder is coming and still can’t stop its approach — because knowing when doesn’t tell you how, and knowing the facts of something doesn’t mean you’ve understood it. His first intervention fails almost immediately. Meanwhile, Yun Yeong’s interference in her mother’s romantic life creates ripple effects she didn’t account for.

EP 04

The Town Holds Its Breath

May 9, 2023

The village breathes differently once the murders start. Hae Jun earns his place in the community by being useful — playing teacher while running an investigation underneath. The strategy makes sense; it’s also a description of how someone disappears into a role they didn’t choose. Meanwhile, Yun Yeong’s developing bond with Sun Ae starts costing her things she didn’t budget for when she came here.

EP 05

Operation: Stop the Wedding

May 15, 2023

Yun Yeong takes direct action to derail her parents’ budding romance — and watches Sun Ae respond with a brightness and openness she never saw in the actual version of her mother. This is the episode where the moral math of Yun Yeong’s mission stops adding up. She came here to eliminate a person. She’s been spending weeks realizing she never actually knew that person.

EP 06

Suspects and Secrets

May 16, 2023

Fragments of Sun Ae’s history surface, and what they form reframes Yun Yeong’s understanding of why her childhood was what it was. Hae Jun and Yun Yeong stop pretending they aren’t in this together — not yet trust, something more provisional than that, but honest. What the episode reveals quietly: their separate family wounds are pieces of the same thing.

EP 07

The Price of Knowing

May 22, 2023

The suspect Hae Jun was building toward turns out to be someone he didn’t expect — and the revelation doesn’t just change the investigation. It changes what he thinks he knows about himself and where he came from. The turning point episode: neither lead can pretend anymore that their mission is clean, or that they’re certain about what they’re supposed to do here.

EP 08

Crossroads

May 23, 2023

The midpoint where both leads have to decide who they actually are in 1987, not just what they came there to do. Yun Yeong chooses to protect Sun Ae over completing her original mission. Hae Jun finds that his corrections to the past don’t hold the way he expected. They start depending on each other in a way that neither calls by the right name — and the show is patient enough to let that stay unnamed for now.

EP 09

What We Owe the Dead

May 29, 2023

The question the drama has been slowly building toward: is Yun Yeong’s unhappy origin story her mother’s fault, or a tragedy neither woman had the power to prevent? Hae Jun faces the same version of the question about his father — and the investigation into the murders enters its darkest stretch precisely because the answer isn’t one he’s going to enjoy. The past is not a place where you go to find someone to blame.

EP 10

The Unraveling

May 30, 2023

The killer’s identity becomes harder to deny. Hae Jun is in physical danger for the first time, which changes the texture of everything. Yun Yeong watches a pivotal moment in her parents’ relationship unfold and chooses not to intervene — that silence is the episode’s most decisive action. Something shifts between the two leads that neither of them acknowledges in the room.

EP 11

Darkness at the Edge of Town

Jun 5, 2023

History doesn’t cooperate with Hae Jun’s script for it. The escalations he didn’t anticipate are the drama’s argument that the past has its own momentum — foreknowledge is less a weapon than a burden. Yun Yeong begins connecting the murder case to her own family history. This is the episode where the personal and the criminal timelines stop being parallel and become the same line.

EP 12

The Suspect Revealed

Jun 6, 2023

The killer is revealed — not as a monster but as a deeply sad portrait of how violence can be rooted in warped love and unresolved pain. The drama plays the revelation not as a satisfying twist but as a reckoning, which is the correct choice. Hae Jun and Yun Yeong work together under genuine danger for the first time. What crosses between them here crosses without announcement.

EP 13

The Cost of Change

Jun 12, 2023

The drama’s most ethically demanding episode. Stopping the final murder requires choices with permanent consequences for both timelines — and Yun Yeong confronts the full weight of what saving her mother actually means. Not whether she can rewrite Sun Ae’s story. Whether she has the right.

EP 14

Fighting the Clock

Jun 13, 2023

Racing against the final murder, with physical danger at its peak. The 1987 village is different because these two people were in it — some of those changes are beautiful, some are devastating, and the drama doesn’t flinch from either. Every interference has a return address. Every choice made in the past is coming due simultaneously.

EP 15

Everything That Was Hidden

Jun 19, 2023

Quieter than expected, and correct to be. The murders are resolved; what remains is the aftermath of every truth that surfaced while solving them. Both characters have to sit with what has changed before they can leave. The time machine stops being a plot device here and becomes something more uncomfortable: a symbol of the irreversible.

EP 16

The Road Back · Finale

Jun 20, 2023

Hae Jun cannot leave 1987 yet — and the show gives him time to understand why. His farewell visits to the people he’s come to care for are careful, partial: enough truth to honor the relationship, not enough to destabilize the timeline they’re about to be handed. Yun Yeong returns to a present where her mother is alive and the wound she carried her whole life is simply gone. The romance closes with a reunion that earns its warmth precisely because the drama never rushed it — they find each other not because they ran out of other options, but because they finally have the same answer to the same question.

Full spoilers ahead — everything that happens in the finale and what it all means.

How Hae Jun Stops the Last Murder. Hae Jun stops the final killing not through intelligence but through willingness — he puts his own body in the way of it. The episode earns that moment across fifteen episodes of buildup. This is a man who traveled to 1987 theorizing about evil, and leaves it having decided, in a moment without time to theorize, that some things simply have to be stopped. The distinction between knowing and acting is what the whole drama was quietly arguing about all along.

What Sun Ae Gets Instead. What Lee Soon-ae receives in the rewritten timeline is not a perfect life. She gets one where the specific catastrophe that bent the course of her choices no longer happened — which gives her room to become someone her daughter never got to see. The drama resists the sentimentality of a clean happy ending for Sun Ae and offers something more careful: a trajectory that belongs to her. Not fixed. Redirected.

What Hae Jun Learns About His Father. The truth about Hae Jun’s father is harder and more useful than the version he arrived in 1987 expecting to confirm. The man he finds is not innocent — but he is legible, which turns out to be its own kind of release. What 1987 gave Hae Jun was not the father he wanted. It gave him the real one, and the space to decide what that means for who he is.

Yun Yeong’s Return. Yun Yeong comes back to 2023 to find her mother alive and living the life she deserved. The drama earned this moment by taking the long way to it — by letting Yun Yeong spend sixteen episodes genuinely knowing Sun Ae before asking the audience to celebrate her survival. The wound Yun Yeong carried her entire life is gone because the thing that made it is gone. Not resolved. Gone. The distinction matters.

The Reunion. The romance between Hae Jun and Yun Yeong ends where it began: with two people in the same place for different reasons who eventually realized they were asking the same question. The show handled them with unusual restraint — no rushed confessions, no declarations timed to the plot — and the reunion in 2023 earns its warmth precisely because it was never taken for granted. They recognize each other. That’s the whole ending. It’s enough.