At the end of the 20th century in Qingdao, Shandong, the He and Luo families were friends of life and death for many years. At that time, He's father drowned to save his comrade-in-arms Lao Luo, leaving behind an orphan and a widowed mother without care. To this day, He's mother (played by Ding Jiali) has been raising her two sons Qiu Sheng (played by Zhou Xiaoou) and Chun Sheng (played by Tong Dawei) by selling steamed buns. In contrast, Lao Luo has a prosperous career and has risen rapidly, but he never forgets the grace of saving his life. He always abides by the agreement with Lao He to marry his daughter Xiao Bei (played by Yu Mingjia) to Chun Sheng. Xiao Bei's brother Sheng Li, on the one hand, looks down on the He family's family background, and on the other hand, feels that his failed marriage situation, and strongly opposes the marriage between the He and Luo families. The kind and upright Chun Sheng had to respect Xiao Bei's ideas and work hard towards a better future. After countless twists and turns and tests, Xiao Bei was finally moved by Chun Sheng, who was getting more and more different from him, and the "child marriage" of the two came to fruition. But marriage is not just a matter between two people after all. The practical issues involved behind it, such as relatives and family background, are still an insurmountable gap, which always affects their mood... This film is adapted from Lian Jian's original work of the same name.