She Says I'm the One Who Should Be Saved

[Transmigration into a book + cannon fodder + mildly gruesome + two powerful leads + the protagonist can take a beating]

In a wealthy residential compound where a group of psychopathic butchers are kept like pets, a series of deadly games pit humans against creatures from an anti-world...

The author Ruhuabushiyu, who never writes happy endings, is pulled by the Book Management System into one of his own fantasy novels. Reincarnated as a female cannon-fodder character, he is fated to live and die alongside the story's third male antagonist. To keep living among humans and save the antagonist, he uses his identity as a member of the Butterfly clan to fight the “Spider,” while also disguising himself as a half-human, half-butterfly being who shares the third male lead's tragic fate in order to protect the “Spider.” Together, they endure one deadly game after another.

To save this sick world, he begins to turn bad endings around, rescuing everyone he had subjected to suffering.