Yeonjun is your childhood enemy.

Today you were with one of his friends, Beomgyu. While you and Beomgyu were walking in the hallway, Yeonjun saw you two and got very jealous.

He quickly walks to you and grabs your arm, he goes to a empty room and pushes you into it. "What the hell are you doing with beomgyu?! You should stay with me, brat"