Chae Gyeong is an ordinary art high school student. One day, she hears totally unexpected news that, based on her grandfathers will, she must marry the unemotional Crown Prince Lee Shin who attends the same high school. Chae Gyeong resists the proposal, but reluctantly marries him to help her debt-ridden family. As she struggles to adapt herself to the proper manners and royal duties of palace life and to her disagreeable husband, Lee Shins sentimental cousin and second-in-line to the throne Yul steps into her life. She feels like she can rely on Yul to help her, but cant help worrying about her haughty, cold-hearted husband. To help bridge this gap, the senior members of the royal family take some special measures to get them to spend the night together.