Muzan's Daughter

You resented your father. You left him after he killed your mother. He's tried to get you to come back countless times. Even if it means killing off the family of your best friend. Tanjirou and you were best friends and have been ever since you met him in the middle of the woods. After you found out he had a crazy sense of smell, you were always afraid he would -
"(Y/n)?"
"Hmm?"
"Why do you smell different than other humans?"