Three Kingdoms: Fifty Thousand Heavy Cavalry, and You Call Yourself a Merchant?

[Late Han, Three Kingdoms + farming + commerce + later struggle for supremacy + weak System] Liu Jin transmigrates to the end of the Han dynasty and obtains the Merchant System. Buy low, sell high, and earn System rewards from the difference! Food, copper coins, fine horses, leather armor, heavy armor... He's got it all. While others ruin themselves fighting wars, Liu Jin only grows stronger in business. He only wanted to trade in peace and quietly build up his strength, but before he knew it, he had amassed fifty thousand cavalry. The warlords scoff: “You’re just a wealthy merchant. You dare compete with us?” The next moment, fifty thousand heavily armored cavalry form ranks, their mighty presence shaking the heavens. The warlords turn deathly pale. “...You said you were just a merchant?!”