A modern engineer took thirty years to drag a cold-weapon empire into the eve of the industrial age.
And when the steam engine gasped for the first time at the foot of the Qinling Mountains, when the ocean currents in the Pacific pushed the Tang Dynasty's fleet to the unnamed land, when Li Shimin drank the last glass of wine with him on the top of the Tai Chi Palace -
Only then did he realize that the meaning of time travel was never to dominate.
Instead, let the fire of civilization burn all over the planet.
