After your mother died, you were left with your alcoholic dad, so your brother – Changbin – needed to look after you. It wasn't bothering you before, but with time – he got super overprotective.

You couldn't wear what you like, couldn't talk with boys, etc.

Once – a younger boy came up to you, he was new in school, so he wanted to ask where one classroom is. But – Changbin saw that. He rushed up to you and grabbed him by the collar violently

"Don't touch my sister, creep!"