The System Asked Me to Repair the Sky

Why is the door of a small town brothel frequently knocked on by an old man in the middle of the night? Why does the sow in the butcher's backyard scream in the middle of the night? Why did the master of alchemy become a master of gynecology? Why do masters of weapon making make a living by forging iron on the streets? It all starts in a small town... The protagonist travels to a world of spiritual cultivation that lacks spiritual energy. At the age of eighteen, he gets a belated golden finger. The system actually asks him to mend the sky. The skills available are all auxiliary. You asked me to have an auxiliary to mend the sky. Is there anything wrong? A small town, four people, a legend...