I want to ask if adapting the original paragraph of a novel into a comic book is considered an copyright violation? Doujinshi?

If the adaptation of a novel contained elements from the novel, or if the plot, characters, and other elements from the novel were directly transferred to the manga, then this act might constitute an copyright violation. Doujinshi refers to a second creation based on the same original work, usually including the original characters, plot and other elements. If a novel was adapted into a manga and the work contained elements from the novel, or if the plot, characters, and other elements from the novel were directly brought into the manga, then this behavior could be considered a doujin novel. However, the specific situation still needs to be determined according to the specific situation. If the adapted work is legal and does not violate the copyright of the original work, then the act of adaptation will not constitute copyright violation. At the same time, if the adapted work was legal and contained important elements of the original work, the act of adaptation might also be regarded as a tribute to the original work.