That extremely long figure that caused zero to take note of flew back and forth between the mountain walls that were as smooth as a mirror. His movements were as quick and convenient as if he was walking on flat land. In this new era, the structure of the human body was far from perfect compared to that of many other beings. Apart from those with high-level abilities who could use their own strength to make up for the deficiencies in the structure of their bodies, the lower and middle ...