I Sold Dead Soldiers in Ancient Times

Traveling back in time to the Great Xia Dynasty where martial arts was respected, I opened a strange shop. We do not sell magical weapons or elixirs here. There is only one commodity for sale: human life. The princes and nobles thought I disturbed the order, and the powerful men and women scolded me for troubling human life. But while they spurned me, they piled boxes of gold and silver onto my counter. Because my dead soldiers are loyal, powerful, and... Abundant. Later, I photographed a copy of the "Grandmaster Lease Contract" on the Dragon Case, Only then did the emperor on the dragon throne understand: The person who can call the shots in this world has long been replaced by me, the "businessman".