Moon Y/n, a 15 years old girl, goes to the palace every day. She listens to what the King says while he's in a meeting. Her village never got any information. The King organizes a party for the prince's birthday. He has to find his future queen. He has 2 years to get to know her better and then the day of their marriage will take place. Y/n's best friend Na Sunyeon is scared he'll lose his best friend. That's why he doesn't like the prince since he clearly likes his best friend. Y/n keeps telling him that the prince would never take his place.