A top modern architectural engineer unexpectedly travels back in time and opens his eyes to find himself reduced to a lowly laborer building the Great Wall! Under the crushing weight of harsh rule and the torment of cruel overseers, he could be buried beneath the wall at any moment. In this desperate predicament, he awakens an extraordinary construction system and unlocks elite building techniques. Leading the brothers who share his hardships, he improves tools, optimizes construction methods, builds the Great Wall stretching thousands of miles to repel foreign invaders, designs magnificent palaces, and uses ingenious engineering strategies to defeat the Xiongnu. From an oppressed forced laborer to a powerful figure who can influence the fate of the realm, everyone wonders just how many astonishing construction techniques capable of overturning the age this extraordinary man, who appeared out of nowhere, has up his sleeve.