Modern engineer Zhang Gong traveled back in time to the Zhenguan period due to an experimental accident. He fell by the Weishui River and was brought back to the camp by the knights of Zhechong Mansion. Armed with modern knowledge but trapped in the age of cold weapons, he struggled to survive amidst the ramming of earth walls and the sounds of government soldiers drilling with an ankle wound. When the logic of the laboratory collides with the iron-blooded laws of the prosperous Tang Dynasty, Zhang Gong, a stranger, needs to use tenacity as a blade to carve his own mark of survival in a strange time and space.
