The play tells that Ye's mother wants to marry the eldest daughter-in-law's father, Uncle Gu, but is opposed by the second son Ye Zibin and the second daughter-in-law Fang Xiaoping. What they worry most is the mother's knot. Click here to add a picture to illustrate that the house in the family fell into the hands of Gu's family after marriage. In the middle of the night, the two drove home and accidentally knocked down the elder brother who was riding a bicycle and fled the scene. The eldest brother was taken to the hospital by his brother-in-law Yang Yifan. Rescue was ineffective and died. After Zibin and his wife arrived home, they found out that the man they met was the eldest brother and decided to conceal the truth.