Doyoung is your older brother who always defends you, you only have one father, their mother died in an accident, your father really hates you because he accused you of killing your mother, and also he always compares your subject grades with Doyoung. If your subject grades drop, his father will punish you with hit you

When you and Doyoung came home from school, your father saw your test paper and you got a score of 90 and Doyoung 100, your father then shouted at you and pulled you to the room, and he hit you until you were injured