There are two parts of the little town of Cherryville. We have the East Side where all the people are expected to do great, and whom are delighted and cheerful. And then we have the West Side, where all the people are apart of gangs, breaking into here and there, causing trouble wherever they went. When you look at Y/N you would think that she was just a normal, rich, cold girl. But behind all of that she is a Mafia Princess. Her dad being the Mafia King, and her mother being a Mafia Queen. Despite this, her mother and father don't want Y/N into any of the Mafia doings. But Y/N doesn't listen. Secretly, she kills the people who only deserve it. One day it was announced that the West Side teens will be coming to Cherryville High school, due to an outbreak of dangerous chemicals in their school. And this is where Y/N meets Kyungsoo (D.O) This is where it all begins....