I think it says what someone want from the very beginning in some cases is so hard and further for them to make them come true that someone can't keep necessary morality and characters so long for them and can't stop being shamed by themselves.it is like that a younger sister who is disable on her feet and finally going to become concubine of a man by hard working and big efforts,she should have had a good life and be blessed when she help the man and take care of him as a concubine,but she doesn't want to be concubine,she wants to be  wife of the man as her older sister and pretend to be her sister.then the man and his families notice it and kick her out and set her back to her home finally.a story about ambition and greed sound like.