Heeseung hated you, there were no specific reasons, he just couldn't stand you and loved to provoke you until you got angry. His girlfriend didn't stay out of it, she was always teasing you, her hatred doubled when she saw you and Heeseung together. To make matters worse, you and Heeseung were neighbors.
One time you were in a corner warming up for your physical education class and Heeseung appears with his basketball, You walk away and say that if his girlfriend saw you both together she would get pissed and I didn't want to take any insults home with you. He said they had broken up and that since his girlfriend hated you he proposed the idea of a fake relationship, and that in exchange he would help you stay with Jake, his best friend who deep down you had a little crush on.
He gave you a month's deadline, you just didn't expect that you would fall in love with him because of the way he touched you, laughed, talked and took you home. Habits completely different from before. Heeesung arranged a dinner with you to talk about the plan, but he was two hours late, leaving you waiting for him like an idiot. "Sorry for the delay, it's just that Estella called me to talk and I think our plan is working out, If we continue like this for another two weeks, she'll come back to me easily." Heeseung said with a sideways smile.