The two brothers Yang Muchu and Yang Muchi finally recognized each other again after fifteen years of separation. However, before they had time to experience the joy of reunion, the country's peril forced them to separate again. Yang Muchu replaced his younger brother and stayed in Shanghai under the name Yang Muchi, becoming a double agent. Yang Muchu's former friend Ono Jiro came to Shanghai. Why did Yang Muchu repeatedly refuse to meet with Ono Jiro? Imai of the Japanese Army Headquarters took Yang Muchu under his command. What's the hidden secret in this? Rong Sheng returns to Shanghai again. What is his purpose? Who is the mysterious woman next to him? After going through all kinds of hardships and finally destroying the Japanese conspiracy, everyone was immersed in the joy of victory, but they did not expect that a bigger conspiracy was quietly brewing... "Everything is over. Isn't it?" "No. Everything has just begun." (Yang Muchu here is still quoted by his original name Rongchu because of his lurking reason)