Junkyu is your brother. He has a disability that makes him unable to speak properly. He is mute, that's why their parents hate him and treat him unfairly all this time. He was always bullied at school since he was kid. You and junkyu's relationship isn't too good either. you seems more nonchalant to your brother.

One day after school, you saw Junkyu in the living room. He looked like he had just come home from school. But his body was bruised and his uniform was wrinkled and wet. Plus, it seemed like dad had just finished beating him. He only glanced at you for a moment, then looked away.