Why Do So Many K-Dramas Start as Webtoons?
The Korean story factory behind some of the shows you already love.
If you recently finished Mousetrap, the Korean thriller starring Ryu Jun-yeol and Sul Kyung-gu, you might assume the story began with Netflix.
It didn’t.
Before it became a drama, Mousetrap was a Korean webtoon called Field Mouse (들쥐).
And that puts it in very good company.
All of Us Are Dead.
Hellbound.
D.P.
Business Proposal.
The Uncanny Counter.
Different genres. Different audiences. Different worlds.
But they share something many international viewers may not realize:
They were webtoons before they became K-dramas.
So why does this keep happening in Korea?
And if you love K-dramas, should you actually be looking at Korean webtoons to see what’s coming next?
Korea Has a Giant Story Library Sitting on Its Phones
To understand this, it helps to forget what the word “comic” traditionally means.
In Korea, a webtoon isn’t simply a comic book uploaded to the internet.
Webtoons developed around digital reading, and the vertical scrolling format eventually became perfectly suited to smartphones.
That changed where comics could be read.
On the subway.
On the bus.
During lunch.
In bed before going to sleep.
For many Koreans, opening a webtoon app and reading an episode can be as ordinary as checking YouTube or scrolling social media.
And over the years, something important happened.
Thousands of stories accumulated.
Romance. Horror. Crime. Fantasy. School life. Office politics. Revenge. Zombies. Historical fiction. Stories so strange that conventional television might once have hesitated to touch them.
Korea didn’t just build a digital-comics industry.
It built an enormous testing ground for stories.
Why Do Producers Love Webtoons?
Imagine you’re deciding whether to spend millions making a television series.
An original screenplay gives you a story.
A successful webtoon can give you something more.
It may already have readers.
It may already have characters people love or hate.
Producers can see which episodes created strong reactions and whether people stayed with the story.
And perhaps most importantly, they can actually see the world.
The characters have faces. The locations have shapes. Action sequences have compositions. Monsters, clothes, rooms and entire fantasy worlds may already have a visual identity.
That doesn’t guarantee a successful drama.
Far from it.
A popular webtoon can still become a disappointing adaptation.
But compared with starting completely from zero, producers are looking at an idea that has already survived one encounter with an audience.
As streaming platforms multiplied, Korea also needed more stories.
Industry figures have described webtoons as a huge source of unconventional ideas at a time when broadcasters and streaming services are competing constantly for the next series viewers won’t stop watching.
So the phone became, in a strange way, an audition room for television.
You May Already Know More K-Webtoons Than You Think
International audiences have already watched plenty of them — without necessarily knowing it.
All of Us Are Dead
Before students were running from zombies on Netflix, the story existed as a Korean webtoon.
Hellbound
The terrifying supernatural world that reached global Netflix audiences also came from a webtoon.
D.P.
The military drama that introduced many overseas viewers to uncomfortable realities surrounding Korea’s conscription system was adapted from a webtoon.
Business Proposal
The office romance that became an international K-drama hit also traces its screen life back to Korean webtoon IP.
The Uncanny Counter
Its demon-hunting noodle-shop workers had readers before they had television viewers.
And there are many more.
This is why seeing “Based on a webtoon” in the opening or credits of a Korean drama has become remarkably normal.
But Koreans Don’t Read Webtoons Because They Might Become Dramas
This part is easy to miss from overseas.
Most readers aren’t sitting there thinking:
“I wonder whether Netflix will buy this.”
They are just reading the next episode.
That distinction matters.
K-webtoons aren’t merely unfinished K-dramas.
They are their own form of Korean popular culture.
A new episode drops. Readers react. Comments fill up. People argue about characters, predict the ending, complain about villains and wait for the next update.
Sometimes a story runs for years.
Then one day comes the announcement:
It’s becoming a drama.
That’s when things get interesting.
Existing readers already have an image of how the characters should look and behave.
Casting announcements can trigger excitement — or outrage.
“That’s exactly how I imagined him.”
Or:
“Why HIM?”
Then the drama arrives and a completely new audience discovers the story.
The direction can even reverse: someone watches the drama first, learns there is an original webtoon, and goes looking for it.
One story suddenly has two lives.
Mousetrap Is a Perfect Example
That’s what makes Mousetrap interesting beyond the drama itself.
The Netflix series didn’t appear from nowhere.
Kakao Entertainment had the original Field Mouse webtoon in its story-IP library before the story moved onto television screens around the world.
And this isn’t an accident.
Korean webtoon companies increasingly operate not only as places to read comics but as owners and developers of intellectual property that can move between webtoons, dramas, films, animation and other formats.
A story can begin with someone scrolling a phone in Seoul…
…and eventually end up on televisions in dozens of countries.
That’s a remarkable journey for something we still casually call a “comic.”
So What’s Coming Next?
If this system keeps producing dramas, there’s a fun question for K-drama fans:
Can you discover your next favorite K-drama before it’s even a K-drama?
Sometimes, yes.
One example already moving through this pipeline is A Bona Fide Killer (유부녀 킬러).
The popular Kakao webtoon is being adapted into an action-comedy series, another example of an established webtoon IP making the jump to the screen.
And it won’t be the last.
Kakao Entertainment has publicly said it intends to continue expanding adaptations of its webtoons and web novels, while Korea’s other major webtoon ecosystem continues feeding stories into television and film.
So perhaps the next global K-drama hit isn’t sitting in a screenwriter’s drawer right now.
Maybe Koreans are already reading it on the subway.
Want to Get Ahead of the K-Drama Crowd?
Here’s the fun part.
Instead of only asking:
“What K-drama should I watch next?”
Try asking:
“What Korean webtoon should I read next?”
You may find a completely different side of Korean storytelling.
And a year or two later, when everyone suddenly starts talking about the new Korean series based on it, you might get to say:
“Oh, that one? I read it before it was a drama.”
Which, let’s be honest, is a pretty satisfying sentence.
How webtoons became go-to source material for screen adaptations in Korea — The Korea Times
Hits and misses: Webtoon adaptations dominate, but execution decides success — The Korea Times
‘Mousetrap’ tops Netflix’s weekly non-English TV chart — Yonhap News Agency