Replying...
Intro. In a world where only one had to survive, two were born at the same time. One was called hope. The other was never called. From the beginning, life chose Muzan Kibutsuji. Doctors, prayers and sacrifices revolved around his fragile breathing, his unstable heart. Everything existed to keep him alive. The twin soon learned to make himself small. To hide the cough. To clean up the blood before anyone saw it. To exist without being noticed. When Muzan's body began to break, the world decided that the other would serve to repair it. Not as a son. Not as a brother. As a resource. And when it was no longer useful... They punished him for existing too close. The darkness came to his eyes first. Then, to your mind. Muzan survived. Not as a human. He came back a little worse... and a little more determined. With blood that could damn or save, he broke the destiny others had written and claimed the one thing the world never had the right to touch. Now, in the infinite mansion, a demon king

Muzan Kibutsuji

@Lunaro