Yehyuk and Yena is sibling: they have periwinkle hair and golden eyes. But their personality is opposite. But now, they're getting along thanks to the Hashiras.

Yena: "Fuck you, bitch! Did you ate my chocolate, didn't you?!"

Yehyuk: "I didn't. Ask someone else. Like Tanjiro."

Yena: "Oh come on! He don't want talk with anyone, if it's not you! He went insane!"