So I choose to put what the girl is like.... 

Her name is Park Na Young, she was born on July 4th, 1996. She loves to play the violin and Electric guitar. Her big brother is 4 years older than Her and he has already debuted in a group.. 

Her Mom abondaned her and her big brother when she was 4 amd he was 8. Leaving them with their father. when their father got cancer and was in the hospital he told her big brother to protect her. 

She has a bestfriend who is a guy, Who is the same age as her whom he sees her as a sister. She lives with her big brother and her Big Cousin.. Enjoys the colors green and baby blue. 

And  thats it.... 

its only in the fanfic that her parents are gone... Let me know... who you think her Big Brother is,  Who her friend may be and who her Big cousin is...

I`ll give you a hint... her big cousin is one year older than her big brother. which her big brother is 4 years older. 

Her best friend.... 

the hint is... 

Her cousin and her bestfriend is in the same group togther. And her bestfriend is the Maknae of The group...