Lu Bu Has a Transmigration Portal

Lu Bu steps through a portal and unexpectedly arrives in the modern city, then returns to the Three Kingdoms carrying all kinds of treasures. Corn, sweet potatoes, peanuts, potatoes, chili peppers... You Three Kingdoms nobodies, ever seen these before? They're already being mass-produced on my turf! What? I'm supposed to be hanged at White Gate Tower? Not a chance. I've already read Romance of the Three Kingdoms. I'll beat Cao Cao until the crap comes out of him. What if I can't beat him? Don't worry, I've got an AK-47 that can sweep across the ancient battlefield...