Are there any novels with the main theme of the female protagonist suffering from a terminal illness, but with a more optimistic ending?

I recommend "Transforming into a Beautiful Girl with a Terminal Illness". This book was a light novel written by the author, Xiao Lang of the Southern Song Dynasty. It was a funny and sarcastic novel. The story was about how Qin Kun, who had cultivated in the Immortal Realm for ten years, reincarnated his soul into his sister's body in order to save his sister who was in the terminal stage of a terminal illness. Hence, he became his sister, Qin Xueruo. Some things were really beyond his control. The ending of this novel is quite happy. If you're interested, you can read it. I hope you like my recommendation. Muah ~