春天的马拉松

Two successful professionals in a complicated relationship have no use for marriage. But through times thick and thin, their attitudes change.

Since Yu Xiaoqiang married Liu Guangyao seven years ago, she's settled into the quiet life of a regular housewife. Her life is turned upside down when one day, computer engineer Bao Jiaming comes to her house to fix a computer and she discovers that Guangyao is having an affair with a clothing designer he works with, Lan Xin. Meanwhile, Jiaming puts everything he has into starting a company with a friend, but in the midst of that, his girlfriend Du Du breaks up with him and financially cripples the project. At the lowest points in their lives, Xiaoqiang and Jiaming find comfort in each other's friendship and start to develop feelings for one another.

In the early 1930's Shanghai, various forces raged in the storm and the society was in turmoil. Ding Yiqing, the daughter of a wealthy businessman from Ningbo, came to Shanghai alone and met Communists underground workers Dong Hongyu, Lin Mosheng, Du Ying and many others. They experienced the outbreak of the War of Resistance against Japan in 1938. After the Pacific War in 1942, they completed various tasks for the revolution, letting the passion of youth burn as they strive for their ideal day.