Sixty-year-old mountain village mail carrier Zhou Qishan is about to retire, and his daughter Zhou He returns home to accompany him on his final few mail routes. Along the way, she watches her father deliver packages for elderly people with limited mobility and also witnesses the joy of admission letters being delivered into the hands of children in the mountains. Zhou He, who once held a sense of estrangement because her father was busy with work year round, gradually comes to understand his persistence through rainy mountain paths and delivery after delivery, and helps him organize his route materials so that experience can be smoothly handed over to the young mail carrier Lin Tao. On the day of retirement, a letter left by his deceased wife allows father and daughter to see each other's lingering care anew. Father and daughter also learn to cherish family more and guard the kindness and sense of responsibility in ordinary life.