If you have watched a Korean drama such as Itaewon Class, Sweet Home, or All of Us Are Dead, you may have already encountered a Korean cultural phenomenon without realizing it. Webtoons are digital comics designed primarily for smartphones. Instead of turning pages horizontally like a traditional comic book, readers usually scroll vertically through the story. That simple change had a surprisingly large impact on Korean storytelling. As smartphones became part of everyday life, webtoons gave Korean creators a new way to publish stories directly to readers. Episodes could be released regularly, and creators could build audiences without relying entirely on traditional print publishing. The result was a huge library of characters and stories that could potentially move beyond the webtoon itself. This is where webtoons became particularly important to Hallyu. Successful webtoon stories can be adapted into television dramas, films, animation, games, and other forms of entertainment. Some adaptations have subsequently introduced the original stories to audiences who may never have read a webtoon before. The relationship works in both directions. A popular drama can send viewers back to the original webtoon, while a successful webtoon can provide producers with an established story and an existing fan base. But the real significance of Korean webtoons goes beyond adaptation. The format encourages creators to think visually and episodically. Stories must give readers a reason to continue scrolling, often ending an episode with a question, surprise, or emotional turning point. That rhythm can translate surprisingly well to modern streaming entertainment. Webtoons therefore represent more than another branch of Korean popular culture. They are part of a larger Korean content ecosystem in which stories can move from a smartphone screen to television, cinema, gaming, and eventually an international audience. For anyone trying to understand why Korean entertainment produces so many interconnected stories and adaptations, webtoons are an important piece of the puzzle.