after the day you saw your boyfriend, Minu and your adopted sister, Ra-Im kissed each other, you decided to cheat on him back with Eunhyuk as it was just to make Minu jealous--it was a plan that you planned with Eunhyuk--

you and Eunhyuk were teamed up with two other classmates to play dogdeball during PE class in the court and you were jealous of other girls as you saw they were teamed up with Minu and he seemed to like it.