Prince in Troubled Times, I Rule the World by Prodigal

Li Ce, a modern special forces tactical commander, traveled to the fictional Wei Dynasty and became the notorious useless sixth prince. Faced with the constant pressure of the prince and the eager gaze of the alien race, he chose to "self-defiled" to hide his weakness, and used the behavior of "prodigal" to cover up the truth about the development of business and military industry. From inventing perfume glass to make money, to improving iron smelting and gunpowder to strengthen the army, Li Ce built a steel army from scratch in the northern fiefdom that swept the world. Not only does he want to clear away the grievances of his mother's family, but he also wants to wipe out the powerful families in this troubled time, drive out the Northern Di and Southern barbarians, and establish an empire on which all nations will come to dynasty, on which the sun never sets.