In the Qin Interstellar Empire, I Used the Reverse Scale to Instantly Kill the First Emperor

In a parallel universe, Qin Shihuang found the elixir of life and achieved immortality. So after more than 30,000 years of development, Great Qin developed an interstellar civilization, established the Great Qin Interstellar Empire, and began to expand continuously. The protagonist traveled to this world and started a counterattack from a cleaner who was not even a soldier.