The pretty Demon King..

The Kizuki didn’t necessarily say it out loud to him but most demons think Muzan is the prettiest demons, He’s more pretty when he’s calm, Muzan didn’t bother hearing their thoughts on his looks cause the him its a waste of time,

Muzan: “…Huh…”

Muzan heard a demon talking to themselves about how pretty Muzan is but which demon was it…?