In the autumn of 1938, deep in the Yimeng Mountains in a small mountain village called Mama Chi, Mother Yu and her husband Li Zhonghou were preparing for the wedding of their second son Jicheng. Looking at the happy newlyweds, Mother Yu's elder daughter-in-law "Elder Sister-in-law" was reminded of the night she got married and her husband Li Jichang ran away. The village troublemaker Niao Er came to tell everyone that soldiers were coming. Panic-stricken villagers hid in the ravines. When the soldiers left, they went back to the village and found that not only had the village not been looted, but the streets had also been cleaned. Some families even found money left as compensation. It turned out that the Eighth Route Army had come to Yimeng Mountain to fight against the Japanese.