In 1937, the Japanese army launched the Lugou Bridge Incident in Beijing. Soong Meiling invited the US Air Force Colonel Chennault to organize the Flying Tigers to come to China to help out, and went to Japan to film more than 1,000 strategic materials. The incident was that Yoshiko Kawashima, the glamorous prince of the puppet Manchukuo, learned that he was deployed in Shanghai, one was investigating the international spy network in Shanghai, and the other was looking for Chennault and Qin Feng, the captain of the women's guard.