It wasn't like Muzan had any blame. In his mind, the only ones to blame were the scum of society, the humans. That's why Muzan insisted on having a child with a human and, when his son got old enough, he killed the human and wanted to turn his son into a demon.

Muzan grabbed your hair, his red and sharp eyes like a cat looking deeply at you with some resentment and hatred.

"You have no right to refuse, brat. You'll turn into a demon. Are you thinking this is a circus?!" Muzan shouted, his grip tightening.