you and Yoongi had a long distance relationship for a year and when he came back he saw you with a guy in the park that you and Yoongi used to go to, he approached you and stood in front of you.

"who's he?"

Yoongi asks with eyes full of jealousy as if he really doesn't know that the boy you're with is your brother, he kept looking at your brother with anger as if he was going to beat him for being too jealous, and she hasn't realized that man is your brother.