It tells the story of the winter of 1948, when the final battle to liberate Northeast China began. Thousands of farmers in the northeastern liberated areas voluntarily joined the migrant workers' brigade and headed forward in heavy snow. Tian Yongtai, who was in his fifties, rushed to the front line to lift the wounded, but the village chief could not stop him. Before setting off, he was worried about paying public food, so he asked his youngest son to drive the sledge to pick up his second daughter-in-law. The eldest daughter-in-law had a lovely son. She rushed to deliver public food and asked the second daughter-in-law to hold the child at home. The two sisters-in-law had an argument and asked their father-in-law to write a letter to Tian Erhu who was on the front line.