I Threw a Grenade at Li Er from the Start, and He Asked Me to Become the Imperial Preceptor

Living alone in a remote mountain village, Li Meng is transported by the System and transmigrates to the Zhenguan era, where he meets Li Er and awakens the [Civilization Leap] System. From an agricultural revolution that raises yields to three shi per mu to an industrial boom of roaring machines, he builds a technological Tang dynasty with his own hands. The aristocratic clans strike back? The imperial clan rebels? Foreign enemies surround them? He crushes them all! Li Er? He's just an executor, that's all!