After Passing Through the Book, I Cured the World-Destroying Witch into a Sick Girl

[Western Fantasy] + [Slow Tempo] + [Single Female Protagonist] + [Developing a Yandere] + [Golden Finger] He traveled through time and became a useless servant with no system or talent, and was sent to serve a witch who could go on a rampage and kill people at any time. It doesn't matter, he just wants to work hard and change her destiny so that she doesn't become the BOSS who was wiped out by the protagonist in the original work. He did the cooking, cleaning, watching over her, and talking to her. She finished her meal, put down the quilt, and began to talk to him. Everything is going in the right direction. Until that day, someone tried to hurt him. For the first time, her magic exploded for "protection" rather than "destruction". She stood in front of him, her white hair dancing wildly in the magic storm. When she looked back at him, her red eyes were filled with his reflection. "Don't you dare touch him." Her voice was soft. "You are my servant, you can only be mine, no one is allowed to touch you." Lin Feng suddenly realized that he seemed to have healed her a little too much.