Lin Yichen, a modern criminal policeman, died in the line of duty and his soul traveled to the Ming Dynasty. When he opened his eyes, it turned out to be the bloody battlefield of the Jingnan Campaign in the fourth year of Jianwen! King Yan's cavalry broke through Jinling, and he accidentally rescued an old minister of Jianwen who was on the run, and received a mysterious "Arms Note" as a gift. Since then, a modern soul has made waves six hundred years ago - making gunpowder, smelting steel, building businesses, and innovating the military system, step by step! See how the little detective changed his fate against the odds, played with dimension reduction attacks in the Ming Dynasty, built his own business empire, and aspired to the pinnacle of power!
