This is a rare realistic picture book. With super style and the courage of facing reality, the author portrays the city life of the family of a boy named Yi who were from the countryside. The work focuses on the simple but trivial flow of time in one day, showing the present ordinary Chinese people's busy, hard and warm daily life which is full of human atmosphere. In the fast-developing China, the living status of Yi's family is universally representative. They are the strangers of the city and the guardians of the countryside. The pursuit of an ideal life and the significance of survival lay a heavy and warm background for this book. From this simple and warm story, we can read out a high level of consciousness of life care.