There was no mating bite. Su-ah bit his hand. They just had sex. CuriousGumWad
In some abo stories, couples can “bond” without actually marking by bite, like emotionally bond (which either way u don’t think it’s the case here but the way he sees su ah probably has to do with why he didn’t even smell the alpha pheromones from someone else)
I love the story but wtf are these proportions in the new chapter…there’s a panel where Kihoon has a long ass torso and short af legs