I, at the Beginning, Traveled Through Time and Became a System

Others traveled through time and took the system, but I traveled through time and became the system. He has no body, no magic, only a brain full of modern knowledge, and wears a fool's armor. He was fooled into pretending to be a magician: saltpeter to make ice, phosphorus and fire to catch ghosts, and scientific tricks to deceive the Tang Dynasty. The magic stick is fake. But it must be true to unify the Tang Dynasty and defeat the Xiongnu Khan until he calls me "Father". This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.