After Crescent Moon was shut up at home, she would neither eat nor drink and became as thin as a rake. Her anxious parents hurriedly devised a scheme: they told Crescent Moon that they agreed to her being married to Dune Boy, while secretly sending word to a different bridegroom whom they had arranged for their daughter, telling him to come and marry her immediately.
月牙兒被關起來後，整天不吃不喝，消瘦得快不成人樣了，她父母親著了急，想出了一條「妙」計，告訴月牙兒說，答應她和沙山子成親，暗地裡差人通知他們為月牙兒訂好親事的對象，火速前來娶親。