[You're his non-biological brother.]

He had spent the whole day with Jeon-son, and when he came home late, he saw you at the door "What do you want?" Annoyed until he saw you "Today was a good day for me, don't mess with him, you are smaller than me, because you have a bigger body, there is no reason to order or forbid me" He gets annoyed and pushes you "And Also..I had dinner already.."