After Shutting Down the Server, I Became the Only Patch in the World

On the day the game was shut down, the protagonist entered the abandoned online game world that he had participated in testing. While others were leveling up, worshiping gods, and grabbing equipment, he could see error reports floating around the world. Every time he fixed a bug, he could temporarily rewrite a rule, and also made the saint, the female devil, the female knight and all kinds of powerful people laugh and cry.