It tells the story of the soul exchange between a prince who has lost his smile and a saddle-carrying merchant who has lost her memory.Joseon Crown Prince Yi Gang, who lost his crown princess, gave up his own happiness and only thought about revenge. When Yi Gang's long-planned revenge plan finally took the first step, he met the saddle-carrying merchant Park Dal I who looked exactly like the deceased crown princess, and exchanged bodies for unknown reasons, falling into a series of chaos.(Source: Soompi; edited by MDL)