Becoming a god starting from blacksmithing

Shen Chi, a blacksmith, had spent his entire life forging iron. Until one day, to save an old man, he grasped the sword of an enforcer from the Yansheng Pavilion. A burning sensation spread across his chest—iron-gray patterns like rust. That was the "Heart Imprint," a long-lost power—not relying on spiritual talent, nor on inherited techniques. It relied on—every promise you make. In this world, everyone is taught "not to make promises lightly." Because the heavier the promise, the more painful the breaking of it. Because there are those who, once they promise something, will fulfill it even at the cost of their lives. They are called "Promise Bearers." Shen Chi knew nothing of this. He only knew—"What I have promised, I must do."