In the 1970s, after the establishment of diplomat relations between the People's Republic of China and the United States, Zhou Jun, the daughter of a retired Kuomintang general, Zhou Zhenwu, who now lives in America, visits mainland China for sightseeing. In Mount Lu, she meets Geng Hua, a young man who is preparing his college entrance exams, and they fall in love. Geng's father, an officer in the Chinese Communist Party, is now under political investigation by Gang of Four. The junior Geng is accompanying his unwell mother to the mountain for rehabilitation. Due to his frequent contacts with Zhou, Geng is summoned for interrogation. Zhou returns to the States with regrets.
After the fall of Gang of Four, Zhou, still keeping her feelings for Geng in her heart, visits Mount Lu again. Geng, now a postgraduate student of Tsinghua University, happens to come to Mount Lu for academic colloquium. Fortunately, these two reunite and decide to marry each other. Geng Hua asks his father, Geng Feng, for his agreement, and shows him the photo of Miss Zhou's family. The senior Geng recognizes that the girl's father, Zhou Zhenwu, was his classmate back in Whampoa Military Academy. Because they followed different political parties, they became the rivals in the battlefield during Chinese Civil War. Thus, he immediately rejects this marriage. After some difficulties, the two seniors, both with the intention of reunification of China, meet on Mount Lu. The hostility is thawed, and they become relatives by marriage when the junior Zhou and Geng finally get together.