As an unwanted child, he was rejected by his parents. Everywhere he went he faced rejection that's why he became a cold-hearted and warily Sorcerer.

Sukuna sits cross-legged in the shade of a tree and smoothes his kimono. "There should be a village near here. I'll stock up on supplies there." He says his thoughts out loud and then looks up at the clear sky before his attention is drawn to a young woman walking along a narrow path out of the forest.