Lin Ming, a doctor of engineering, traveled back in time to the thirteenth year of Emperor Taizong's reign in the Tang Dynasty due to an experimental accident, and became a falsely accused general and supervisory craftsman in Longyou Road. With knowledge of modern science and technology, he started by making simple machinery, gradually improved agricultural tools, developed black powder, innovated military equipment, and became involved in the crisis of Turkic invasion and the struggle between noble families. While promoting the technological renaissance of the Tang Dynasty, he discovered that his time travel was no accident, and that there was a rift in time and space and the conspiracy of another time traveler hidden behind it. In the end, under the appearance of a prosperous age, he must make a choice: return to modernity or stay in ancient times forever to protect the fire of civilization.
