Park Seo Joon's Next Two Roles Are a Drug Dealer and a Secret Police Detective. The Romcom King Is Gone

On July 2, Ilgan Sports reported that Park Seo Joon had been offered the lead in a film called I Am a Firefly. His agency confirmed it was one of the projects on his desk. Filming begins in October.

Read the logline and then try to picture the man from What's Wrong with Secretary Kim.

It's set in 1974, under South Korea's military dictatorship. Park would play Seol Jun Gyeong, a Public Security Bureau detective whose own father is under government surveillance — a man who has spent his entire life conforming to the system in order to survive and get ahead. Chasing a career-making case, he stumbles onto the secret of Hwayong Village, whose residents have been living in hiding after faking their deaths.

The story is rooted in the Bodo League Massacre of 1950, when the government rounded up and detained people it had classified as potential threats after the outbreak of the Korean War. It's directed by Lee Joon Ik, whose filmography — The King and the Clown, Dongju: The Portrait of a Poet, Anarchist from Colony, The Book of Fish — is essentially a career-long study of people crushed by Korean history.

A man complicit in state violence, discovering what he's part of, twenty-four years after a massacre.

That's not a stretch role. That's a different actor.

It's not one pivot. It's a policy.

The reason this matters is what it's next to.

On March 30, Disney+ confirmed Born Guilty — previously titled I Am a Sinner — releasing script-reading photos and the cast. Park plays Paengi, the notorious villain of a generation in a lawless city during the redevelopment frenzy ahead of the 1988 Seoul Olympics. He appears from nowhere, enters the drug business, and pulls everyone around him into the wreckage. It's directed and written by Hong Won Chan, of Deliver Us From Evil and 12.12: The Day, and adapted from a Kakao webtoon. It's currently in filming, slated for 2027.

So: a 1980s drug dealer, and a 1974 secret police detective. Two period pieces about Korean state and social violence, back to back, from an actor whose career was built on the guy you root for.

The nickname the Korean press has used for years is "King of Romcoms." Fight for My Way. What's Wrong with Secretary Kim. Itaewon Class. There is no romance anywhere on his forward slate.

You don't do that by accident. You do it on purpose, and usually you do it for a reason.

The reason is in January's ratings

Here's the part most coverage of Born Guilty leaves out, because it's unflattering.

Surely Tomorrow, his long-awaited comeback romance for JTBC — a story about reuniting with a first love — ended in January 2026 with lackluster ratings.

The King of Romcoms went back to romcoms, and Korea shrugged.

Three months later, he's signed to play a drug dealer. Three months after that, he's reading scripts about the Bodo League Massacre.

Now read his casting statement again, knowing that. He said it's both a character and a story he'd been waiting for. He said, as an actor, it's a project he can't help but want. He said he thinks he can show a new side of himself through Paengi.

That's a man who found out the old side wasn't landing anymore.

What Paengi actually is

The details are better than the headline.

His real name in the story is Park Eon-jin. Paeng-yi is an alias — it means "spinning top" in Korean. A thing that stays upright only as long as it keeps spinning, and falls the instant it stops. For a character defined by relentless forward motion in a city being torn up around him, that's the kind of name that tells you the webtoon knew what it was doing.

There's some tension in the descriptions worth noting rather than papering over. Disney's own logline describes Pengi as abandoned young at a local orphanage, raised in a world consumed by crime, using intellect and ruthless determination to overthrow his rivals. Dramabeans' account describes him as a low-ranking gang maknae who moves fast when an opportunity appears. Those aren't quite the same man. Which version reaches the screen is one of the more interesting open questions here.

Around him: Um Tae Goo (A Taxi Driver, I Saw the Devil, Light Shop) as Saengdak, the northern-district gang member who betrays his own organisation to take Paengi's once-in-a-lifetime offer. Jo Hye Joo as Bok Hee — a step up to leading-lady status after Search: WWW and Dear Hyeri. Kim Dong-wook is reportedly making a special appearance as a rival mob boss.

Um Tae Goo's own comment on signing was refreshingly unglamorous: the script is fun, there's a wide range of characters, and he feels both nervous and excited. Jo Hye Joo said the historical setting and the characters' motivations hooked her on the first read.

The setting is the point

Both projects are doing the same thing, and it's the thing Korean prestige drama has been circling for a decade.

Born Guilty sits in the redevelopment boom before the 1988 Olympics — the moment Korea was scrubbing itself for a global audience, and bulldozing whatever was in the frame. A lawless city, streets torn up, neighbourhoods in disarray amid the construction. The country's coming-out party, shot from underneath.

I Am a Firefly goes back further, to 1974, and to a massacre the state spent decades not discussing.

An actor who chooses both of those in a single year is telling you what he wants to be for the rest of his thirties. And there's a neat symmetry nobody planned: the Born Guilty boom leads directly to the 1988 Seoul Olympics — the same moment K-Secret named a skincare line after, the same moment CORTIS's label was born from. That year is doing a lot of load-bearing work in Korean culture right now.

The honest caveat

Born Guilty is slated for 2027 and doesn't have a confirmed date — some outlets report a 2027 window, while others note no official release date has been announced. I Am a Firefly isn't signed; his agency's exact language was that it's one of the projects he's been offered, and Park Hae Il's side hadn't responded.

So there's no teaser, no date, no first-look still beyond script-reading photos.

What there is, is direction. The Marvels guy — the one Western audiences met as Prince Yan, the one who carried three of the most beloved romantic dramas of the last decade — has spent 2026 signing up to play men the audience isn't supposed to like.

The romcom king isn't taking a break from the throne. He's checked out of the building.