A Farmer in the Three Kingdoms

When others travel to the Three Kingdoms, they either recruit fierce generals or become emperors. Chen Mo travels to the Three Kingdoms and just wants to quietly grow potatoes. The village head demands taxes? Give him two bags of potatoes and stop bothering me. Bandits come to rob? Give them ten bags of potatoes and get lost. Warlords fight? None of my business, my corn in the field is about to ripen. Years later, the various warlords fight until their heads bleed, only to find that the entire world's food supply is in the hands of one farmer.