I Serve as a Shield for the Villain in the Fast-Traveling World

Hua Youlan, an ordinary college student, picked up a red stone on her graduation day, and inexplicably came to a room full of white wallpaper. A system came out and told me to protect the villain in the article, and when I complete all the tasks, it can grant me any wish I want to have. If you don't agree, you can only stay here forever. In order to go home, you have to agree and embark on a journey to protect the villain. (There are emotional scenes, no cp)