The protagonist Mu Mu inherits the old pawn shop left by his grandfather. After binding to the system, the pawn shop can connect to the world, and others can defeat monsters and upgrade. The protagonist wins by "collecting rags", confiscating the black iron sword to make an electromagnetic knife, and the soul absorber is immune to black magic. This "waste utilization" style of becoming stronger makes Mu Mu from a poor boy who can't pay the electricity bill to a "creditor of all worlds" who even Hongjun has to look at.
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