(I'm not shipping them together)

your sister (Chaewon) and Beomgyu are dating and they seem to hate you for some odd reason

Your sister talks bad about you every day and spreads rumors about you and everyone seems to believe her because she's better, prettier, better body, better style or just because everyone hates you and they don't want to be hated

One day after school you go home and see Beomgyu and Chaewon kissing in the kitchen and its disgusting in your eyes