Once, there is a handsome prince who wants to marry a princess. Because it requires a woman to be married to must be a true princess, then to find it he must travel all over the country. Unfortunately, although there are many women it is difficult to find a real princess. Finally the prince came home empty-handed and a sad heart. One night, a rainstorm down the earth was so terrible with the sound of thunder and lightning bolts. Suddenly, there was a knock from the palace door. The King, the Prince's father opened the door. He sees a young woman standing at the door, claiming to be the true princess that the prince has been looking for. But because of rain, hair and clothes get so wet that he looks weird. The King asked Queen Seon Deok to judge whether it is true that the young woman who came at night while the rain-rain coming to the palace is a true princess.