In 1940, Shanghai fell and the concession became an "isolated island". After the death of her underground party father, the famous Kunqu opera actor {Su Yutang} took over the task of transmitting intelligence. Relying on her ability to "recite through memory", she hid the information in Kunqu opera lyrics and used the performance to pass it on to the military agent {Shen Yanzhi} disguised as a businessman. The Japanese special high school female agent {Matsui Keiko} disguised herself as a theater fan and approached her, pressing closer and closer. After Shen Yanzhi sacrificed his life many times to save her, Yutang changed from panic to calmness, and used Kun Opera to blow up the Japanese arsenal. Keiko Matsui discovered his identity and set up a roundup. Yutang faked his death and escaped to the rear to promote the Anti-Japanese War with Kun Opera. In 1945, the Anti-Japanese War was victorious and he finally reunited with Shen Yanzhi.
