Old Zhang, Wu Gang, and Li Gui Shou are all ordinary people. What is the connection between them? Zhu Yi Pin decides to go back to the scene where Li Gui Shou fell off the cliff to look for clues. This time, he finds that Li Gui Shou's carriage had been tampered with, and two rivets were placed on the wheels of the carriage. Li Gui Shou's carriage got burned not because he had smoked but because someone placed white phosphorus in the carriage. The mountain road is rugged, and the wheels are damaged, causing the white phosphorus' spontaneous combustion to burn the carriage. (Source: Viu)