I Really Didn't Cultivate to Immortality, so I Just Used My Brain.

It's hell when you open your eyes: no spiritual roots, being ignored, and being suppressed by monsters. The modern contractor traveled through time and became a little emperor, picking up blueprints to transform the world of immortality. From lard bombs to hot air balloons, from the exchange bureau to the Great Wall defense line - he wants to use his mortal body to make the weakest race stand on top of the world.