In the winter of 947, Shao Jianbo (Kenny Lin), captain of the 203rd detachment of the Northeast Democratic Allied Forces, sent an investigator Yang Zirong (Zhang Hanyu) undercover to sneak into the "Tiger Mountain", the largest bandit hill, in order to seize the distribution map of tens of thousands of advance troops controlling the Jiuling Mountains in Northeast China from bandits. Yang Zirong won the appreciation of Mountain Carving (played by bandit leader Tony Leung Ka Fai) and Eight donkey kong for his resourcefulness, and was named the "Laojiu" of Hu Wei. Shan Diao was suspicious by nature, and sent people to test Yang Zirong many times. While dealing with bandits in many ways, Yang Zirong ventured to spy for his comrades at the foot of the mountain.