The story takes place in the 1930s in Shanghai, known as the "Paris of the East" and China's Eastern metropolis, where crises are brewing. It was a day in that year when on the stage of Shanghai's Great World, as usual, a wonderful Peking Opera was being performed. Zou Kailin, a famous Peking Opera amateur, was giving an intoxicating performance with his authentic every move, earning applause from the audience below. At that moment, several pairs of alert eyes were fixed on Zou Kailin on stage. After one act, just as Zou Kailin entered the dressing room, he was confronted by guns. They were members of the Nationalist Party’s Military Statistics Shanghai Special Action Group, ordered to arrest Zou Kailin. With remarkable skills, Zou Kailin cleverly used his light kung fu to break free from their encirclement and ran onto the street in his costume. Unfortunately, the enemy had already cast a wide net, leading Zou Kailin into a city filled with shadowy spies - Shanghai, a city heavy with espionage.