Two professional killers, Qianlong and Heizilong, were hired separately to kill each other. The two met on a boat and started fighting. Unexpectedly, the boat's rudder lost control and they encountered dangers many times. The two turned enemies into friends and helped each other in the same boat. The boat drifted to an island and saw a group of powerful people gathered together. They recognized by their voices that their employers were among them, and they turned out to be the "Two Heroes of Sichuan" brothers who were famous in the martial arts world. In order to find out the truth about why they wanted to kill each other, they infiltrated among the powerful people to spy, and discovered a great secret of the martial arts world...
