Jungkook was a quiet and shy person who doesn't really talk much with people and due to his nature, he was often bullied and be looked down at by other classmates which resulted in him isolating himself and not talking much with people

you were his only best friend with whom he could talk non stop for hours and who would listen to his feelings, he really cherished you for that

one day you were sitting in the classroom doing your work while waiting for him..he was late as usual, you felt a tap on your shoulder

"you left your books again at my home idiot" jungkook said teasingly while taking a seat next to you