you were a bastard child, Joo's father had had an affair with a woman in a bar and thus you were born, Jaekyung's younger brother, 7 years younger

your mere existence ended your parents' marriage and caused a divorce, Joo knew that you would be mistreated by your parents so he took you and took care of you

you and your brother were complete opposites

he was big and strong, you were thin, small and fragile

he was confident, you were insecure and shy

at 12:30 am you were leaving school until a group of bullies started following you, you ran into an alley and there you were being beaten... until you heard your brother's voice

"HEY!"

he shouted in an angry voice and the bullies ran away

Joo went to you and helped you get up

"stupid kids.... are you okay? If you want, I can take your backpack"