Yumi's Cells

Spoiler level: Opening premise only. This page introduces the original webtoon, its storytelling idea, and its adaptations. It avoids later relationships, major character decisions, and endings.

What if every time you tried to say something important, a small group inside your head had to agree on what you should do?

That’s the starting idea behind Yumi’s Cells, a Korean webtoon that turns one woman’s thoughts and feelings into characters with opinions of their own.

The original series, 유미의 세포들, was created by Donggeon Lee (이동건).

Unlike many internationally known Korean fantasy adaptations, it didn’t begin as a prose web novel. It was created as a webtoon, following Yumi’s everyday experiences while also showing the busy inner world of her cells.

The story later inspired a Korean television drama combining live action and 3D animation, as well as an animated feature film.

If you’re discovering Yumi’s Cells through the drama or looking for the original English comic, here’s how the versions fit together.

Yumi’s Cells at a Glance

Detail	Information
Original Korean title	유미의 세포들
English title	Yumi’s Cells
Original creator	Donggeon Lee (이동건)
Original medium	Korean webtoon
Korean platform	Naver WEBTOON
Korean webtoon status	Completed, 512 episodes
Official English comic	WEBTOON
English webtoon status	Completed
Main genres and themes	Slice of life, romance, emotions, personal growth
Television adaptation	Korean live-action and 3D animated drama
Drama seasons	Three seasons, including Season 3 in 2026
Animated film	Yumi’s Cells: The Movie (2024)

The main thing to remember is that the original illustrated webtoon comes first.

The television and film productions are adaptations, not replacements for the original comic.

On this page

What Is Yumi’s Cells About?

Yumi is an ordinary woman dealing with the kinds of experiences that don’t usually require a fantasy world to become complicated.

There are relationships, work, misunderstandings, small decisions, and feelings that can be difficult to put into words.

But the reader sees more than Yumi’s outward behavior.

Inside her mind, the story gives individual thoughts and emotional impulses their own characters: the cells.

Rather than presenting every decision as a single, simple feeling, the comic imagines those inner reactions as something closer to a busy group trying to agree on what matters.

That creates two ways of following Yumi.

On the outside, there’s her everyday life.

On the inside, there are the cells reacting to what happens around her.

The two layers work together.

This isn’t presented as a scientific model of the human brain. It’s a storytelling device that makes otherwise invisible feelings part of the comic’s action and humor.

What Do the Cells Represent?

The Korean word 세포 means cell.

In the title, 유미의 세포들 literally refers to Yumi’s cells.

But these aren’t simply microscopic biological illustrations.

The webtoon personifies different parts of Yumi’s inner life, allowing readers to see thoughts and emotions take part in the story.

That can turn a brief moment in the outside world into a much busier event in the inner one.

A facial expression, an awkward interaction, or a difficult choice can involve more than the words someone actually speaks.

Even the early Korean episode titles point toward that interest in ordinary behavior.

The first numbered episode is called 표정관리, an expression associated with managing or keeping control of one’s facial expression.

Another early installment is titled 프라임세포, which the English edition renders as Prime Cell.

These details show how the comic makes internal reactions part of its storytelling vocabulary.

The cells offer a playful way to look at Yumi’s experience. They shouldn’t be treated as a literal account of how real human psychology works.

Why Is Yumi’s Cells Different From a Typical Fantasy Webtoon?

Many Korean webtoons use extraordinary abilities, unfamiliar worlds, or supernatural danger to create their central conflict.

Yumi’s Cells takes a more everyday starting point.

Yumi doesn’t need to enter a Tower or discover a leveling system for her choices to matter.

Her ordinary circumstances already contain uncertainty.

The imaginative element comes from how those circumstances are represented.

The inside of her mind becomes a place where feelings can be seen as characters, even though Yumi’s outside world remains recognizably ordinary.

That means the comic can make a small social interaction feel significant without requiring an enormous external event.

It also gives readers a reason to pay attention to the difference between what a person thinks, what they feel, and what they actually say.

The cell metaphor is a way of exploring those gaps.

And while romantic relationships are part of the story, the official English WEBTOON also categorizes it with themes of inner life and self-growth.

That broader framing is useful if you’re expecting a comic concerned only with choosing a romantic partner.

A Korean Perspective: Everyday Words and Unspoken Feelings

One interesting feature of Yumi’s Cells is how ordinary Korean expressions can become opportunities for visual storytelling.

Consider 표정관리.

It’s a familiar expression for keeping one’s facial expression under control, especially when a reaction might reveal more than a person wants to show.

The expression isn’t unique to one culture in its underlying human experience.

But seeing it as the title of an early Korean webtoon episode gives international readers a useful entry point into the original language.

There’s an outside behavior—maintaining an expression—and an inside experience that may be much more complicated.

That contrast suits a story in which emotions have voices and personalities.

It also helps explain why the Korean original can be interesting even to someone who already knows the broad premise from an English summary.

The original episode language, everyday vocabulary, and visual presentation work together.

This doesn’t mean every moment in Yumi’s life should be treated as representative of Korean women or Korean office workers generally.

It’s one creator’s fictional story, told through recognizable situations and an unusual visual idea.

Was Yumi’s Cells Originally a Web Novel?

No. The original Yumi’s Cells was a webtoon written and drawn by Donggeon Lee.

The Korean Naver WEBTOON lists the completed comic with 512 episodes.

The official English WEBTOON also lists the illustrated series as completed.

There is, however, a separate Korean prose adaptation.

Naver Series has a completed novel-format edition titled 유미의 세포들, with writing credited to Wang Gidae (왕기대) and illustrations credited to Donggeon Lee.

That edition is presented as a novel based on the popular webtoon.

This reverses a publishing path international Korean-content readers may already know.

For some other Korean properties, the prose novel came first and the webtoon followed.

With Yumi’s Cells, the original comic came first, and a prose version was developed later.

The separate novel’s chapters should not be confused with the webtoon’s 512-episode catalog.

The existence of a Korean prose adaptation also doesn’t establish that an equivalent official English prose edition is available.

For the original story in English, the licensed WEBTOON remains the clearest starting point.

How Does the K-Drama Adapt the Webtoon?

The live-action drama brings Yumi’s outside world and the cells’ inner world into a different medium.

According to TVING’s official production announcements, the series combines live-action performances with 3D animation.

That allows the adaptation to present Yumi through actors while giving the personified cells a separately animated presence.

Kim Go-eun plays Yumi in the television series.

The drama has three seasons, including a third season released in 2026.

CJ ENM lists the third season as an eight-episode drama, with Kim Jae-won joining the cast.

The drama’s combination of live action and animation is an important production distinction.

It doesn’t, by itself, establish that every individual scene, relationship, or line of dialogue follows the webtoon exactly.

Those kinds of differences require direct comparison of the relevant episodes.

For now, the useful distinction is between the original scrolling comic and a television adaptation that gives its inner-world characters an animated screen presence.

Is There Also a Yumi’s Cells Movie?

Yes.

Yumi’s Cells: The Movie is a separate South Korean animated feature film.

The Korean Film Council lists its theatrical release as April 3, 2024, with a running time of 93 minutes.

That makes it different from the live-action and 3D animation combination used by the television drama.

The film isn’t another numbered season of the TV series.

And a movie’s release doesn’t mean the original webtoon has resumed serialization.

The comic, the television drama, and the animated film are separate ways of presenting material associated with Yumi’s Cells.

If you’re new to the franchise, understanding that distinction is more useful than trying to combine every adaptation into one episode numbering system.

For the film’s choice of story and how Yumi herself becomes an animated character, continue with the movie adaptation explainer. It covers the film’s published career premise without revealing the ending.

Where Can You Read Yumi’s Cells Officially?

For an English-language reader, start with the official Yumi’s Cells WEBTOON.

That is the licensed English comic.

The platform identifies the series as completed, although website and app access conditions can differ.

For the Korean original, visit Naver WEBTOON — 유미의 세포들.

Naver also offers the comic through its Naver Series catalog, where access and payment conditions may differ from the regular webtoon listing.

If you’re specifically looking for the later Korean prose adaptation, use its separate Naver Series novel listing.

These are legitimate official paths, but they serve different formats and reading preferences.

Don’t assume that access purchased on one service automatically carries over to another, or that the number of chapters in the prose version matches the comic.

Where Can You Watch the Drama?

In South Korea, TVING provides official access to the Yumi’s Cells drama.

The third season was released in 2026, following the first two seasons.

International availability is more complicated because streaming rights differ by region and season.

CJ’s official 2026 announcement identified distribution through HBO Max in selected Asia-Pacific markets and Disney+ in Japan for Season 3.

That announcement shouldn’t be read as a guarantee that the same platform carries all three seasons in every country.

Before subscribing, check the local streaming service’s current listing for the season you want.

If you plan to follow the television story, Season 1 is the natural starting point, followed by Seasons 2 and 3.

But you don’t need to watch the drama before starting the original webtoon.

The comic is its own complete reading experience.

Should You Start With the Webtoon or the Drama?

Start with the webtoon if:

• You want Donggeon Lee’s original illustrated version.
• You’re curious about the cells as a visual storytelling idea.
• You prefer to follow the source material before comparing adaptations.
• You want an official English comic that is already marked completed.

Start with the drama if:

• You prefer live-action Korean television.
• You’re interested in the combination of actors and animated characters.
• You want to experience Yumi’s world through television performances.

For my personal take on the television starting point, read my Yumi’s Cells Season 1 review. I discuss Kim Go-eun’s performance, the animated cells, and the relationship frustrations alongside the warmth I felt.

Neither option requires you to memorize a fictional universe or understand an elaborate fantasy power system before beginning.

The original webtoon is a useful place to see how a simple question—what is Yumi thinking?—can become an entire approach to storytelling.

And its adaptations show how that idea has traveled from Korean digital comics into television and film.

For an English-speaking reader, the official English WEBTOON is the most direct introduction to the original work.

Official Sources and Further Reading

• WEBTOON — Yumi’s Cells — official English comic, creator, and completion status.

• Naver WEBTOON — 유미의 세포들 — Korean original by 이동건, first episodes, and completed 512-episode listing.

• Naver Series — Yumi’s Cells Comic — separate Korean comic catalog and reading options.

• Naver Series — Yumi’s Cells Novel Adaptation — Korean prose adaptation by Wang Gidae.

• CJ NEWSROOM — Yumi’s Cells Season 3 — television adaptation format, third season, and international distribution announcement.

• CJ ENM — Yumi’s Cells Season 3 — third-season production and episode information.

• Korean Film Council — April 2024 Box Office Report — official Korean Film Council publication recording the film’s April 3, 2024 theatrical release.

• TVING — Yumi’s Cells: The Movie — official streaming listing confirming the 2024 animated film and its 93-minute running time.