After Being Demoted for My High Achievements, I Turned Around and the Empress Begged Me to Protect the Country.

The prince who traveled through time held an arms exchange system, and was feared by the empress and planned to be sent to Lingnan. On the way, he collected money and stockpiled guns, wiped out all ambushing bandits, and conquered the princess, female generals and miracle doctors. The villain, the King of Han, colludes with the enemy to kill his father and spreads rumors to force the palace. The male protagonist leads troops to Beijing to settle the unjust case, refuses the authority of the court, cultivates the fiefdom, and builds an armored fleet. Three years later, the empress comes to visit and repent.