After the September 18th Incident in 1931, Cheng Jintang, a rising star in the Shanghai business community, witnessed the atrocities committed by the Japanese army. He transformed from a businessman who only cared about profits to a patriotic businessman who secretly supported the anti-Japanese war, establishing a dual identity system.
Cheng Jintang used his business talents to deal with Japanese business companies, accumulating wealth in the fields of textiles, medicine and other fields. At the same time, he secretly funded anti-Japanese activities and launched a secret war with Kentaro Matsumoto, the head of the Japanese secret service.
