I Signed In to Get the Snow Dragon Cavalry, Then Forced Emperor Wu of Han to Abdicate

An ordinary modern man transmigrates into the body of Crown Prince Liu Ju, just as the Witchcraft Crisis is unfolding and he is about to be forced into rebellion. He activates the sign-in System and starts with ten thousand Snow-Dragon Cavalry troops, staging a Han Dynasty version of the Xuanwu Gate Incident to seize the throne. He slaughters Jiang Chong and the other treacherous ministers overnight, takes control of Chang'an's military forces, and surrounds Ganquan Palace with cavalry, forcing Emperor Wu of Han to surrender power and eventually abdicate. Once in power, he reforms the bureaucracy, makes schools and medical clinics widely available, curbs the powerful clans, and unlocks steelmaking, firearms, and ocean-going ships. He conquers the Xiongnu in the north, subdues the Western Regions, Baiyue, and Joseon, crushes Rome and Parthia in an expedition into Central Asia, and lands in North Africa to expand his territory. He builds an army, navy, and air force, forging a Han Empire that spans Asia, Europe, and Africa. No saintly mercy: every opponent is crushed.