Depose Me as Prince? I Make Myself King!

Li Jing accidentally traveled through time and became the crown prince of Wei Dynasty. Before I had time to be happy, I found out that I was being ostracized in the court, hundreds of officials were impeached, and the emperor wanted to abolish the throne? Li Jing decisively gave up the challenge. But the emperor system was accidentally awakened! Famous generals? Purchase! Food? Purchase! Artillery and firearms? Purchase! … Some years later. "You want me to go back and inherit the throne?" "Then ask my people if they agree!"