It tells the story of a mother and her two sons who lost their husband. The younger son became a thug by joining the wrong crowd, committing robberies, and becoming a thug, while the older son became a well-educated and well-mannered young man. However, the mother devotes all her attention and care to the older son. One day, the younger son extorts money from a poor woman who works at a cafeteria, destroys her belongings, and beats her mentally ill son to steal his money. On a rainy autumn evening, when the older son goes out to buy medicine for his mother, wearing his brother's shirt, the boy who was beaten by his younger brother mistakes him for his younger brother and beats him to death with a brick. As the saying goes, "I put on a coat after the last rain," the film shows how he realizes everything after his brother's death.