When I Woke Up, I Became the Heroine's Sister [Short Story]

It's not scary to be transported into the novel I just finished reading. It wouldn't be scary to dress up as a background female supporting character who only appears a few times in the novel. Even if the novel I entered was a bloody novel that tortured the heart, body, heart, lungs and heart, it wouldn't be scary. The scary thing is that I have been in this world for a whole week, but I haven't even opened my eyes. In short, I became the heroine's seriously ill sister. *First person Concept: Mary Sue adds some sand sculptures