In Front of the Well of Gods and Demons, I Sold My Soul and Became a Killer

In troubled times, there is no humane world, it's all about fighting and killing. Fighting is fun! During the Five Dynasties and Ten Kingdoms, the world was in chaos, and "the art of creating chaos" was rampant. Warlords from all over the world are at war with each other, and the people are in ruins. A mysterious bounty killer who just wants to protect himself and his sister. In order to stay away from the flames of war, they hid everywhere, just to be alone. However, something unexpected happened, and he was selected by a mysterious force and had to enter the world again to complete a task that was destined to be impossible to return.