The Chinese-style father-son relationship is very delicate, and can usually be summarized by labels such as "subtle", "introverted", "repressed", "wrong", etc. This article looks at the big from the small, and slowly unfolds the story through the No. 4 Bus the male protagonist Jin Xipu's daughter-in-law was riding "accidentally" falling into the river. The relationship between the father and son has ups and downs, from hostility to harmony, from suspicion to trust, and finally the great reconciliation of the century. The story is full of twists and turns, touching, exciting, and vividly depicts the family bond between father and son and the great love in the world, and reveals the suspense one by one. Art comes from life and is higher than life. This novel focuses on true feelings. It does not seek to completely change the Chinese-style father-son relationship, but hopes that readers can resonate with it, be enlightened, and cherish the people around them.