I Picked Up the Greatest Villain in the Story (15+ Revised Edition)

I possessed a BL novel I thought was a hunter story. Life in the novel was exactly like reality, except for the addition of several fantasy elements. Until I accidentally saved a child on the edge of a cliff. "My name is Lee Jian. Can I ask what your name is?" "I'm Sehun." "Sehun?" Han Sehun was the name of the male lead in the original story. A guy who was crazy about blood, crazy about slaughter, crazy about fighting, and crazy about the seme role. Still, come on. There's no way I picked up the future villain, right...? But what kind of younger brother strips his brother naked and ties him to the bed? No, isn't that something you're supposed to do to the uke? But why is he doing ...