On returning from Japan, Chan Jun learns that the Japanese have hatched a plot to kill Dr. Sun Yat Sen. Together with his fellow students from the Ching Wu School, he foils the plot.

Dr. Sun leads a movement to free China from its Japanese occupation. While on a tour of China he is constantly assaulted by assassins hired by the Man Chu leaders. The Chun Do school of martial arts is tasked to safeguard Dr. Sun's passage.—Il Tesoro