Sleepy-C is the credited artist for the popular webtoon Omniscient Reader's Viewpoint, but contrary to a traditional solo manga creator, Sleepy-C functions as the name of an artistic team. This team belongs to Studio 3B2S and is responsible for creating artwork for REDICE Studio. The head artist of the Sleepy-C team, a South Korean woman who chooses to remain anonymous, serves as the main art director. She draws the key artwork for the main characters and provides artistic direction to the various specialized departments within the team, which include storyboarding, drawing, coloring, background, and polishing.

The head artist's background began in a childhood home that was open to comics and caricatures, leading her to start drawing at a very young age. Before working on Omniscient Reader's Viewpoint, she was part of the team that worked on the webtoon Tomb Raider King. The main director of that series gave her a positive evaluation, which led to her becoming the main artist for the Sleepy-C team. The creative process for Omniscient Reader's Viewpoint is highly collaborative. It begins after the original author finishes writing, followed by production meetings to set the direction. The team creates storyboards, then the drawing and coloring teams illustrate the characters, the background team adds environments, and a producer adds the script. A polishing team finalizes the work before it is reviewed by a director for any necessary corrections. The head artist has met the original author, singNsong, on several occasions and communicates with them to develop characters, noting that the author respects the team's artwork.

Omniscient Reader's Viewpoint is the Sleepy-C team's most notable original work. It is a webtoon adaptation of a popular South Korean webnovel of the same name by singNsong, which began serialization on the WEBTOON platform in May 2020. The series has achieved significant international success, amassing over 340 million views and millions of subscribers worldwide. The print edition of the English comic is published by IZE Press. The Sleepy-C team's work on the series earned the Minister of Culture, Sports and Tourism Award in the Manhwa Category at the 2021 Korea Content Awards.

In terms of adaptation history, an anime adaptation of the Omniscient Reader's Viewpoint manhwa was announced in July 2024 at Anime Expo by Crunchyroll, with Aniplex and Crunchyroll involved in its production. The head artist has expressed that she would be grateful for an animated series and is primarily concerned that any studio involved understands the characters and story to stay true to the original work. A live-action Korean series adaptation has also been reported to be in preparation.

The recurring artistic identity of Sleepy-C is defined by a studio-based, team-driven production model, which the head artist has described as a process that sits between traditional comics and animation production. The team's artistic focus is on depicting the large-scale battles and action sequences, such as the Disaster of Floods arc, as well as expressing the deep psychological characteristics of each character to create a sense of realism. The head artist has noted that a particular challenge and point of pressure is adapting scenes from the novel that provide only brief descriptions, requiring the team to conduct extensive visual research and discussion to remain faithful to the original work. The industry significance of Sleepy-C lies in demonstrating the successful, high-quality production model of Korean webtoons, where a team of specialists works under a central art director to produce a globally popular title. The team's work on Omniscient Reader's Viewpoint has become an iconic work in the world of Korean webcomics, and the head artist has been invited as a guest of honor to major international conventions like Anime NYC and Japan Expo, reflecting the global reach of the medium.