The erhu music used in the Guapeng section in "My Second Brother and Second Sister-in-law" comes from the famous erhu song "River Water".

"River Water" is a musical work by Min Huifen, which is included in the album "Top Ten Famous Songs by Chinese Erhu Masters".

Plot summary:

In the second year after the college entrance examination was resumed, the educated youth brothers Zhou Wen and Zhou Wu both passed the exam after a year of hard study. At this happy moment, due to a misfortune in the family, only one of the two brothers could go to school. Zhou Wen chose to escape at the critical moment and revealed the fact that Zhou Wu was not his mother's biological child. The sad Zhou Wu also left home.

Zhou Wu once arranged a marriage to a woman named Li Yingzi. Li Yingzi was a brave person who dared to speak and act. The two went through many hardships and finally got together, and they considered everything for the Zhou family. After the Zhou family returned to the city, Zhou Wen, who became a cadre, began to expand his selfish desires, and his relationship with Zhou Wu became tense for a time. In the end, Zhou Wen embarked on a path of no return.

After Zhou Wen was arrested, Zhou Wu and Li Yingzi went to see him in prison. Zhou Wen was particularly moved. When the two brothers mentioned the past, Zhou Wen regretted it endlessly. The Third Plenary Session of the 12th Central Committee of the Communist Party of China was held. Li Yingzi and Zhou Wu decided to return to the countryside to work hard. Hand in hand, they entered a new and hopeful rural life.