Zhang Heiwu is from Shanxi. The sponsor of the escort. This man has a dark face, and his brother ranks fifth. Because of his martial arts, his reputation spread far and wide, and he was called "invincible" Zhang Heiwu. During the Qianlong period, Zhang Heiwu was a martial arts master of Emperor Qianlong. He was persuaded by Emperor Qianlong to set up the first escort agency-Xinglong Escort Agency. It is the earliest escort agency in China, specializing in armed escort for the rich and escorting valuables such as cashboxes and jewels. Later, once the escort saw bandits in the distant mountains, he shouted, "Come with me, escort the car, and come back safely after half a year." In Shaanxi dialect, "Wu He" and "Heiwu" are homophones.