😋I have the following recommendations for your needs: 1. "The Day I Become a Japanese High School Girl": This book is a light novel. The protagonist will not only travel to another world, but also become a Japanese high school girl. At the same time, there will be elements of a virtual world and two dimensional world. This is definitely a novel with a sickly side. I strongly recommend it! 2. "Third Master, Your Wife Is Tearing Scum With Her Hands Again": This book was a sci-fi space genre. The main character was a queen from outer space. She was very powerful but also very sickly. At the same time, the male protagonist was definitely a sickly and delicate character for her. 3. "The 999th Strategy Guide to Tackle the Villain": This book is a sci-fi space type. The protagonist is constantly attacking various villains in the mission of quickly changing. At the same time, it also contains a sweet love story and is also a very sickly book. 4. "Trash Cultivation Koi Fish": This book is an Eastern fantasy type. The protagonist was originally trash, but he was accepted as the last disciple of the first immortal cultivator. Later, he was reborn in an otherworldly city. Among them, the female lead also had a very unique personality and was very sickly. 5. "The Queen of Books": This book is about a fight in the palace. The female protagonist is a book lover who is possessed by a bad queen who doesn't like books. The collision of their different hobbies and personalities is very interesting. It also contains the elements of illness. The above is my personal recommendation. I hope you like it.😗