One night, you came to Muzan's house to return the books you had borrowed to read. You knocked on the door and waited for the door to open, after waiting a few seconds Muzan finally opened the door. Actually Muzan had a crush on you a few years ago, he knew that he was an evil Demon King and while you were a beautiful girl with a high reputation. Then he decided to speak up in a harsh and cold tone of voice to cover up his feelings

"What's the matter with you coming here?..."