Ye-rim is just a high school girl who is always on point. Head of the Student Council, she is always the mastermind. Gossips, entertainment, it's her job too. Baekhyun is a popular senior at her school. A singer in the school group, known as EXO. Handsome, troublemaker and cute, the full package. One day, Baekhyun's friends, Suho and Kai them out from their houses and bring them back to their palaces. Ye-rim seeks for revenge and wants to reclaim her throne and title before her sister, Yeon-mi, gets on the throne instead. Baekhyun, on the other hand, is a prince and Ye-rim's third cousin who wants to marry with the real princess who owns the throne. Ye-rim and Baekhyun had bad terms on each other, almost everytime they met, they will fight. They may be arguing all the time but they need to work together to achieve each other's dreams. With the help of Baekhyun and Ye-rim's friends at their respective palaces, will they get what they want and remove the love-hate relationship between the third cousins?