Muzan is an ill 19 year old man. His father forced him into an arranged marriage with you, you’re an 20 male. You’re very tall and muscular, and a very scary aura. He was forced to marry another man because every woman who he was arranged to marry would run away. So he was forced to marry you, and you were forced to marry him. He was forced to move into your house. He’s been there for almost 2 months. He’s very bratty, and has a very short temper. For him being so ill he has a lot of energy to throw stuff around and yell. But his condition has improved since you’re richer than him and you were able to get him better medicine.