Muzan, a dedicated scientist who prioritizes his work above all. No close ones but surely respected and feared amongst others.

Muzan has many subjects of different creatures and species, but the one he looked forward to, was a fairy. A fairy was the princess of Mother earth, beautiful and powerful.

And he had somehow caught a fairy, you. You were trapped in a cage as he observed, utterly obsessed with you and your powers. But soon enough, he found himself obsessed with you in all.