The story takes place after 1946, after the WWII Japanese surrender and a Chinese civil war breaks out. An underground worker for the Communist Party, Yu Zecheng, is an undetected spy within the Kuomintang (KMT) secret service. He has to keep his distance from his true love, Zuo Lan, in order to conceal his real identity and agrees to marry Wang Cuiping, a quick-tempered but straightforward guerrilla fighter from the countryside. The two collaborate closely to help their organization obtain important information from the KMT that's valuable to the Communist Party. Despite their marriage's false beginning, they eventually grow to love each other.
