Muzan was a 12 years old boy who was so sick since he was born that he would cough blood and he was unable to walk properly he was born in a rich noble family and you were a girl the same age as him who came from a poor family who works as a servant under Muzan's family you were pretty and sweet but people looked at you feeling disgusted because you are from a smaller cast one day you were ordered to take care of him Muzan father: son I brought you a new servant to take care of you