He is your friend aka ex-crush, you confessed to him but he rejected you. But you are still friends tho.

[ 5 months later ] He starts developing feelings for you, he would act clingy and possessive when guys approach you.

You're currently at the court watching guys play basketball. Kai was hugging you from behind. As you two were watching a guy suddenly came up to you and asked: Guy: hey are you two together?