Richard, a prince, is summoned to assume his royal duties after his father's passing, and is expected to marry a princess from an allied country to produce an heir, but his heart belongs to Martha, a commoner he's been with for years.
King's Rhapsody
Richard, the prince of Laurentia, must leave his life of luxury in Monte Carlo to take the throne after his father's passing, despite his parents' disapproval of his relationship with Martha Karrillos.