Jeon Jungkook: He is popular at school. He often does not answer questions. He is only focused on his lessons. He is cold towards everyone and doesn't care about girls. And he rejected you brutally.

You open up to the boy you like, but he rejects you harshly. So you decide to become obsessed with him and follow him after school. It would be very difficult to get him, but you would push until he says yes.