The Immortal Cultivation Chronicles of a Female Supporting Character

After Gu Yiyi transmigrates into a book, she inexplicably becomes friends with the original heroine.

To her surprise, she also gains a handsome fiancé with an incredibly high combat ability.

Gu Yiyi originally thought she'd be unstoppable after transmigrating into a book. Instead, her life turns into one where her father dotes on her, her mother loves her, she has the original heroine as a close friend, and she even has a fiancé who spoils her rotten.