Who Makes the Omniscient Reader Webtoon? Sleepy-C, UMI & the Art Team

Spoiler level: None. This article is about the creators and production of the webtoon, not its plot.

Look at the credits for Omniscient Reader, and you’ll see three names: singNsong, UMI, and Sleepy-C.

They cover three different jobs. One created the original novel, another adapted it for comics, and the third is credited with the artwork.

But the artwork credit has a detail that isn’t obvious from the name alone.

Sleepy-C is the name of an art team, with a lead artist directing work across several parts of the production.

The team discussed its process in interviews in 2023 and 2024. Those conversations reveal how much planning goes into turning a Korean web novel into the vertical-scrolling comic readers see on WEBTOON.

Who Does What? Understanding the Credits

The official English WEBTOON and Yen Press listings identify the main creative roles as follows:

Omniscient Reader webtoon creators and their credited roles

Credit	Role
singNsong	Original web novel authors
UMI (REDICE STUDIO)	Webtoon adaptation
Sleepy-C (3B2S STUDIO)	Webtoon artwork

In Korean publishing credits, you may encounter the terms 원작 (original work), 각색 (adaptation), and 작화 (comic artwork).

They’re worth distinguishing.

The original authors provide the story. The adapter prepares that story for a different medium. The art team develops its visual presentation.

Adaptation isn’t simply translation, and artwork isn’t limited to drawing the characters. Both involve decisions about how the story reaches its readers.

You can check the official credits on WEBTOON and Yen Press.

On this page

Is Sleepy-C One Artist or a Team?

This is where the short credit can be misleading.

During a November 2023 interview at Anime NYC, a representative of Sleepy-C explained that Sleepy-C is a team within 3B2S STUDIO, working on artwork for REDICE STUDIO.

The person answering the questions was the team’s lead artist. She described overseeing visual direction while contributing to the artwork herself.

That distinction matters: Sleepy-C is a collective production credit, but it doesn’t mean individual creative direction disappears.

The lead artist described working on major character artwork and helping other team members maintain a consistent visual approach. Different specialists contributed to tasks such as coloring, backgrounds, lighting, and finishing.

So it’s not quite right to imagine a single illustrator drawing every episode alone. But it’s equally misleading to imagine a team working without anyone guiding its artistic choices.

The 2023 interview published by The Beat gives the artists’ own account of that structure.

How Does an Omniscient Reader Episode Get Made?

A July 2024 interview with the French publication Manga News offers a closer look at the production process.

The Sleepy-C representative explained that the team receives storyboards prepared by UMI.

Those storyboards establish a starting point for the comic’s visual storytelling. The art team then discusses how an episode should look, including its overall mood, colors, and lighting.

From there, different kinds of work come together.

From storyboard to finished episode

The process described in the interview can be understood in five broad stages:

1. Planning: UMI’s storyboard provides a basis for the episode, and the art team discusses its visual direction.
2. Drawing: Artists develop the illustrations, with direction and review along the way.
3. Color and effects: Backgrounds, color, lighting, and other visual details are added.
4. Corrections and lettering: The artwork is refined, and text and sound effects are prepared for the comic.
5. Final review: Further feedback and approval come before readers see the completed episode.

This isn’t a rigid formula for every episode. It’s a description of how the team said it worked at the time of the interview.

One detail stands out: visual consistency is something the team actively plans, not something that automatically happens because everyone is working from the same novel.

A character’s expression, the color of a scene, and the surrounding atmosphere all need to feel as though they belong in the same comic, even when different people contribute.

The full account appears in Manga News’ 2024 interview with Sleepy-C.

Does the Original Author Help with the Webtoon?

The published interviews also describe communication with singNsong, the original writing duo.

In the 2023 conversation, Sleepy-C’s lead artist said she had discussed character development with the novel’s authors.

That offers a more precise picture of the adaptation process than either of two common assumptions: that the original authors make every visual decision, or that the comic team works entirely without their input.

The original authors remain connected to the work, while UMI and Sleepy-C have their own responsibilities in adapting and illustrating it.

The interviews don’t establish that every creative choice requires the same approval process, so that shouldn’t be assumed.

What they do show is that the finished comic involves communication across distinct creative roles.

Why Do the Studio Names Matter?

The credits can become confusing when several studio names appear together.

Yen Press associates UMI with REDICE STUDIO and Sleepy-C with 3B2S STUDIO.

In the 2023 interview, the Sleepy-C representative explained that the 3B2S team worked on artwork for REDICE.

That relationship is more informative than treating all three names as interchangeable.

UMI is the credited adapter. Sleepy-C is the credited art team. REDICE and 3B2S identify studio affiliations involved in producing the adaptation.

It also helps explain why a Korean webtoon credit may represent more people than the short list suggests.

That doesn’t mean every Korean webtoon is produced by an identical team structure. Omniscient Reader is a documented example, not a template for the entire industry.

What Happens When the Webtoon Becomes a Printed Book?

The artwork has another journey to make when it moves from a scrolling comic to printed pages.

In the 2024 Manga News interview, Sleepy-C was asked about the Korean physical book edition.

She explained that UMI and REDICE worked on the page layouts for print. Her team handled other artwork associated with the books, including covers and illustrated extras, and could occasionally be asked to adjust material.

This is an important distinction: the people responsible for the original digital artwork aren’t necessarily the same people arranging it for printed pages.

The interview describes work on the Korean collected edition. It doesn’t document every separate step involved in preparing English-language editions.

Yen Press also lists translation and lettering credits for its English comic books. Those reflect additional work involved in bringing the comic to another readership.

If you’re trying to distinguish the English novel, collected comic, and digital WEBTOON, see the Omniscient Reader Editions Guide.

What the Credits Tell Us

A short credit list can make a complicated production look simple.

For Omniscient Reader, the published interviews help fill in the picture: the original authors, the adapter, a lead artist, and specialized art teams all contribute in different ways.

Knowing this won’t tell you whether the webtoon is better than the novel. That’s a different question.

It does help you understand whose work you’re looking at—and why “Art by Sleepy-C” describes more than one person holding a drawing pen.

For a spoiler-light introduction to the original story, its Korean title, and its adaptations, visit the Omniscient Reader Hub.