Lillie von Ehrenberg is the only daughter of a duke. She was trying to inherit the ducal house, but her half-sister Christa, who came along with the death of her mother, the duchess, robbed her of the ducal line. Although she loses her goal, her first love, Crown Prince Alexis, offers her an engagement, and Lillie becomes the Crown Prince’s fiancée. Upon hearing this, Christa stole Alexis out of jealousy.