My lovely mafia step-brothers

This story is about girl in her late teen years. She is SINGLE CHILD of Mr.Kim Seon ho owner of Kim Enterprises. A girl who has faced her death from her loved ones. Betryal from unexpected people whom she used to cherrish.

BTS sons of Ms or Mrs.Park (i will use Ms.Park in story) owner of Park Enterprises. She and her sons have lost their ONE AND ONLY SISTER
Because of their most trusted person.

What will happen if Mr.Kim and Ms.Park will marry?
Will y/n trust BTS?
Will BTS will accept y/n as their sister?
Will their life began happyly after?
If yes
Then will their life be again ruined after unexpected entry of someone Or unexpected TRUTH(S) reveal?

THIS IS MY FIRST STORY. SO I HOPE YOU GUYS WILL LIKE IT AND SUPPORT ME .

NOTE --: Age of every characters is not real

Thank you
- Author nim