The daughter of the marquis, Lady Edilene, the well-known “Perfect Lady”, is actually a former princess of what was once a great nation called Cedentaria. While dreaming of the revival of her home country, she who puts on the mask of the “Perfect Lady”, somehow got a marriage proposal from Prince Schwartz. The wicked Prince Schwartz, who has the persona of the “Ideal Prince”, hinted that he knows who is the traitor behind the fall of her beloved country.