Chen Mingde, a mechanical engineer who died suddenly while working overtime, became a gladiator slave in ancient Rome when he opened his eyes.
While others traveled through the belt system and space, he only had the gear bearing drawings in mind. When the instructor Marcus tortured him to death, he squatted in the scrap pile and knocked out a pedal grinder out of scrap metal.
Chen Mingde wiped the engine oil on his hands and thought: Where are we now? I still have enough blueprints in my mind to draw a mechanical army.
From slave to emperor.