His own father had hated Crown Prince Sado. The king finally orders to kill him by locking him up in a rice-chest. After his death, his wife Hong goes with her son to her parents' house to live there. Some high officials in the court constantly try to harm Sado's son because they don't want him to become king. But Hong's wisdom saved her son, who grows up to become the 22nd king of the Joseon Dynasty (1392-1910).