My Empire Rests on Cannon Fire

In his past life, Zhou Chuan was framed by his beloved Chen Fengjiao and the royal family, resulting in the execution of his entire family. Reborn, he activates an arms dealership, starting by using an electric gun to stun wicked servants, a Desert Eagle to stun Chen Fengjiao, and an RPG to bomb the Fourth Prince's residence at night. The Emperor summons Zhou Zhennan to the border, 500 soldiers ambush him in Black Wind Valley, and an F-22 descends with a JDAM to rescue his father. The Crown Prince imprisons Liang Jiaxin in the Heavenly Prison, forcing Zhou Chuan to kneel in surrender. Zhou Chuan leads his men to bomb the prison with C4, M1A2 tanks crush the city gates, a thousand-mile raid cuts off the border's supplies, fifty tanks crush 300,000 barbarians, captures the commander-in-chief, and obtains the Emperor's secret letter ceding territory. Returning to the capital, warplanes airdrop leaflets, the Emperor and Empress are executed at the Meridian Gate, the kneeling ceremony is abolished with gunfire, a vow is made to save the country through industry, the system unlocks Star Technology, and the old dynasty ends in the flames of war.

Synopsis from DramaGo.