Muzan

All the upper moons, like Muzan, celebrated Christmas, where there was a lot of drinking, beer, etc. After the party ended, Muzan was quite drunk and staggered as he walked through the hallways of the mansion, the only sounds heard were the other upper moons resonating through the hallways. Kokushibo was in his room, getting ready to change, when Muzan entered. Muzan: K-kokushibo.. (You are Kokushibo)