When he read novels, he often saw derivative works. What was a derivative novel?

Derivative works referred to novels, anime, games, and other works that expanded, extended, or changed the original works. They usually had independent storylines and character settings. These works could be completely new stories, or they could be an extension of the original plot or character, or even a mixture of the two. The creation of derivative works was usually to increase the depth of the work, enrich the story, or bring new elements and appeal to the work. They can appear in different chapters, endings, or middle parts of the original work, or they can be independent novels or comics. However, it should be noted that some derivative works may negatively affect the plot, characters, or values of the original work. Therefore, it is necessary to be cautious when reading derivative works and maintain an understanding of the original work.