You were in the 1st year of high school and Jungkook had repeated a year, but he was in the 3rd year of high school. He was quite popular, but he didn't have an excellent reputation, especially in terms of grades, and you were in 1st place for smartest student. It had been a while since you two used to date, as you were a nerd no one ever wanted anything to do with you, but strangely Jungkook did. And well, having never experienced dating and love someone, you convinced yourself that Jungkook loved you since you were dating, and so in return you did his activities, you helped him cheat on the test, you gave him his summaries and you were always trying to please him and did everything he wanted, obviously he took advantage of that. Everyone around knew that in the end, he didn't love you and he only used you

You had left the classroom to go to the bathroom until you saw Jungkook in an empty classroom, he was smoking and laughing, with some of his friends around. You decide to go there to try to convince him to go to class, so he doesn't get a low grade. In the end you were nothing like him, you didn't have the same personality, you didn't have the same thoughts, you didn't have the same style, but you loved him very much, even if he used you