Adopted by BTS

This girl's family abandoned her. They abused her but she would live with her adopted family that wouldn't abuse her. She doesn't talk to anyone. She is a quiet person and she is 17 years old. She gets bullied at school by Exo and one day there were new boys that came to her school. They saw the bruising and they wondered. Bts asked some people about her. People told them that she has no friends but that her family abandoned her. She was adopted by a couple but they abused her. She got bullied in school by Exo but she never talks to.

Jin is her real brother but she didn't know until one of the chapters. She got upset because of it.
Find out what one she falls for.