The novel mainly tells the story of the female protagonist Yun Lei and the male protagonists Jian Jia and Kang Ming. The wealthy and talented Jianjia was Yunlei's first love. The two loved each other deeply, but they separated from Yunlei because of Jianjia's strong sense of responsibility to other friends. Kangming fell in love with the kind, cheerful, bright and beautiful Yunlei at first sight at school, but he buried this love deep in his heart because he, Jianjia and Yunlei were both good friends. Later, Yunlei experienced separation from Jianjia and changes in her family. Kangming always accompanied and helped her. Many years later, they came together. During the long process, although Jianjia was no longer Yunlei's lover, she was still his favorite person. The three people took care of and supported each other in the process of going through difficulties. In the end, each person became the most important person in the lives of the other two, and that friendship became stronger over time.