After his son (Liu Ye) failed the college entrance examination and had to return to his home in the mountains, his father (Teng Rujun), who had been a mountain village postman for most of his life, retired early and arranged for his son to take over his job. On his son's first day at work, the father was still worried after giving him many instructions, so he took his loyal old dog who had been by his side for many years and decided to accompany his son on another letter delivery journey. At first, the father and son walked silently because of the long-term estrangement. Gradually, through contact with different villagers, especially a beautiful girl (Chen Hao), the two gradually opened up and had a deeper understanding of each other. In the beautiful scenery, the son gradually understood the hard work and significance of his father's work, and the father gradually realized that he owed his family for more than 20 years.