Watching the Heroine Transmigrate Into a Book

Ruan Huahua transmigrates into a book, and not just any book, but a story about someone transmigrating into a book. She's neither the heroine nor a supporting female character. She's someone who isn't even mentioned in the original story. She had planned to eat, lounge around, and wait for death, but everyone says she's the hope of saving all mankind! What the hell do I care about saving all mankind? The great demon is way more appealing!