One possible difference could be in the level of detail. The novel might go more in - depth with character thoughts and emotions. For example, in chapter 71 of the webtoon, a fight scene might be shown more briefly compared to the novel, where it could be described with more elaborate language.
Webtoon does have a few 18+ comics. However, their availability can vary depending on your region and the platform's content regulations. Some might be hidden behind age verification or specific access settings.
No, webtoon and manhwa are not exactly the same. Webtoons can come from various countries and have diverse styles, while manhwa specifically refers to Korean comics.