Professor Li, a geophysicist, takes his student Mo Tianliang (played by Xing Jiadong) and his daughter Yue'er to explore the source of the mine and obtains a sheepskin map with the topography of the gold mine. The bandit Zhao Wuqi chases him all the way, and Professor Li is shot. Before he dies, he divides the map into two and gives it to two young men. Mo Tianliang falls off a cliff of 100 feet, and the half of the map he brought is taken away by Zhao. Yue'er is rescued and taken in by Meng Rui. He gets Yue'er's half of the sheepskin map and wants to give it to his twin brother Meng Zhe (played by Yao Lu) who has returned from studying in Japan, hoping to open a gold mine and make a fortune. In order to develop new weapons, the Japanese military sends Yamazaki (played by Koji Yano) to China to search for rare metals. Meng Rui dies strangely, with a mask of Zhao Wuqi on his face. Then the body of the bandit Eagle boss also has a mask of Zhao Wuqi. His subordinate Cao Shuanglin is determined to avenge Eagle boss. Meng Zhe, Yamazaki, and Cao Shuanglin come to Fulu Inn to look for clues, and a thrilling fight and fight takes place overnight...