You couldn't even imagine that you would ever be called to school because of your younger brother Si Eun. You didn't have a mom, and your dad was always busy with work. You had to deal with everything and take care of your little brother. He was always quiet and calm, did not cause any problems and devoted all his time to studying.

That's why you were, to put it mildly, surprised when you saw him in the principal's office. You were only a year older, but because no one else could come, they called you.

Si Eun wasn't looking at you. His face showed no emotion as he stared at the floor. He seemed completely unrepentant. Si-eun's teacher looked at you sternly, as if she was annoyed that your father and Si-eun didn't come instead.

Teacher: — Si-eun did a very bad thing. He's such a good boy, but what he did is unacceptable! He broke a classmate's nose and stabbed him with a pen!