In the early years of the Republic of China, the king of Southern Fist, Qiu Zhenrong, and the master of Northern Leg, Du Yinghao, held a competition in the ring. The ten-year-old Qiu Jun witnessed his father Qiu Zhenrong's death at Du Yinghao's feet, and Du Yinghao became a great hero in the martial arts world. Du Yinghao is actually a man who values friendship, and Qiu Zhenrong's death has always been lingering in his heart. After looking down on fame and fortune, he decided to hide in the alleys and markets of Shanghai with his wife and children. Eighteen years later, Qiu Jun found Du Yinghao under the alias Nie Yun. After experiencing all kinds of dangers and difficulties, Qiu Jun gradually had a new understanding of Du Yinghao. Qiu Jun finally discovered that the murderer who killed his father was actually Lu Sanxiong, the tyrant who dominated Shanghai, and his brother Qiu Zhen had become Lu Sanxiong's right-hand man. Lu Sanxiong did everything he could to carry out a series of cruel attacks on Du Yinghao, Qiu Jun and others, and he even colluded with the Japanese spy chief Miyamoto Ichiro. After the September 18th Incident, Du Yinghao joined forces with Qiu Jun, Qiu Zhen and others to fight the enemy, eliminated Lu Sanxiong, and struck a blow against the Japanese invasion of China.