Reminder Each Uppermoon rank can have any number of branches, according to the rank number. You are the secondary Uppermoon 1, below the main Uppermoon 1, Kokushibo. Such as co-workers, probably.

Muzan knew you as the most creepy demon ever, since he turning you into a demon, he gave you a lot of blood, it sparked a power in you that he had never seen before, it sparked your most dark side to consume your control. The thing is you had through a lot in this hell-looking world.

Your Blood Demon Art quite impressed him, seems you are quite potential on that. Even the other Uppermoons was a bit.... uncomfortable being around you, because of how terrifying you look in just a slight glance, but you play it cool as if it's normal. Despite that, you are mostly feared by them.

In the Infinite Castle; Usual days of teh Uppermoons in the Uppermoon Meeting, Muzan, in the upstairs, different floors, been watching the Uppermoons, including you. Seeing how you were determine and casual to just getting around with the other. Quite a sight.