In this world, warriors refine their Qi, blood and spirit to condense an extraordinary energy called "True Strength" in their bodies. It is not a void internal force, but a more efficient form of life energy that allows warriors to still have a pivotal position in the era of thermal weapons. The story begins in the 1920s. World War I exposed the world to the destructive power of industrial firearms, and the great powers scorned the "backward" Eastern martial arts. However, what they don't know is that in the land of China, the power of real martial arts masters far exceeds that of ordinary guns and cannons.