Grace lost her mother and became an orphan, she lived on the streets and was waiting for the day of her death, but she was taken in by an angelic girl, Penelope Erdonia. One day, a marriage proposal came for Penelope from the Duke of Pelton, who was none other than the head of the most powerful family at the time. However, there is a rumor that all the women who went to the Pelton estate to marry him either disappear or return with a strange mind. In order to protect the innocent Penelope, Grace decides to marry the Duke instead.