A pair of sisters, everyone calls them the White Princess and the Black Princess.
The prince fell in love with Princess Bai at first sight and agreed to come back to marry her. However, her happiness arouses the jealousy of the Black Princess.
The prince was blinded by magic by the black princess, so that he could not see the true face of the bride; the black princess put on the wedding dress and turned the white princess into a duck.
The white princess turned into a duck and found the prince to talk to, but he just turned around indifferently: "I don't know you."
At that moment, Princess Bai's heart broke into pieces.