Set in a 21st-century Korea with royalty and monarchy established, Park Jinyoung is an ordinary music and performing arts student. One day, he hears totally unexpected news that he is the long lost grandson of the grand duke of Busan, making him one of the princes of Korea. He also finds out through his ailing grandfather’s will that he must marry the unemotional and cold crown prince Mark Tuan of the Korean Empire. As he struggles to adapt himself to the proper manners and royal duties of palace life and to his disagreeable husband-to-be, Mark's sentimental cousin and second-in-line to the throne Jackson Wang also steps into his life.