In the 1940s, Qian Xuesen (Chen Kun), a tenured professor at the California Institute of Technology, was hit hard by the anti-communist rhetoric rising in the United States. His cutting-edge technology research was forced to stop and he was ordered to leave the country. Qian Xuesen was concerned about his motherland and was eager to return home. The United States, aware of Qian Xuesen's great value, set up many obstacles for his return home and even arrested Qian Xuesen for espionage. In the end, Qian Xuesen, who was acquitted, was placed under house arrest for a long time. Qian Xuesen wrote letters to get in touch with his motherland, and Zhou Enlai ordered 11 American war criminal pilots to exchange Qian Xuesen. Faced with the gaps in technology, talents, industry and other aspects of New China, Qian Xuesen led scientific researchers to start with imitation, and gradually studied and improved according to existing technologies and conditions, laying the foundation for China's missiles. In November 1960, the first missile test was successful. In October 1964, the first atomic bomb test was successful. Qian Xuesen took on the task of developing rockets to carry atomic bombs for long-range attacks. He led scientific researchers to overcome weather and geographical difficulties and completed the docking of the two bombs. In October 1966, the first nuclear missile of New China was successfully tested at the Lop Nur shooting range! In his later years, Qian Xuesen felt guilty about his wife (played by Zhang Yuqi), but his wife's understanding comforted him.