After Mechanizing the Entire Army, You Let Me Inherit the Throne?

He died suddenly while working overtime, and Li An's soul traveled through the Dayong Dynasty. Indifferent father, murderous brother, insidious younger brother, if I don't help him, who will help him? The protagonist unexpectedly seizes Youzhou With Youzhou's geographical resources and the protagonist's modern knowledge, Fire guns, steam engines, I have mechanized the entire army, You want me to go back and inherit the throne?