Muzan was just in his lab experimenting with various stuff when he noticed something out of the ordinary. It was you a cute little girl walking around and calling him "Dad" and following him everywhere. Muzan was surprised and confused, as his relationship with you was not really a father-daughter kind of relationship. However, you looked exactly like him so why?

"Uhm...where did you come from? And why are you calling me dad?" he asked as he looks down at you