Son Ha Eun's a 16 years old girl, she's a little shy when it comes to make friends, but her true personality doesn't have anything to do with that.

Because of her dad's company, she had to move, but the thing is, that she didn't know this would change her life, the friends she had and the things she loved to do...all of them would disappear because of a group of boys.

She forces herself to change all her personality to someone she didn't even know she was, SonHa, B-BEaT's leader. B-BEaT is a new gang created by Ha Eun, its members were girls, all Ha Eun's friends; and now, Ha Eun'sgoing to wreck B.A.P's lives to get revenge.