A Counterattack from Prisoner to Emperor Across the Qin Dynasty

I became a prisoner in the Lishan Mausoleum. When the overseer's whip was about to fall, I raised a piece of briquettes. "Sir, using this thing, the construction period can be three times faster." Half a year later, I entered Zhangtai Palace as a gift of "elixir". Qin Shihuang's eyes were like lightning: "Can this thing really live forever?" I bowed: "Your Majesty, immortality is vain. But I have thirteen strategies that can protect the Qin Dynasty forever."