Lee Ji Eun's family is rich, Thunder is a member of MBLAQ and there manager is Lee Ji Eun's Dad. As Thunder get to know Lee Ji Eun he askes if she wants to be his "Fake" girlfriend, so he can impress his enemy Yoseob. Will Yoseob fall for it? Does Lee Ji Eun know Yoseob is part of the situation? What side will IU go to Yoseob or Thunder's?