A bowl of free lamb soup he had enjoyed for four years—because of one time he "d…

A bowl of free lamb soup he had enjoyed for four years—because of one time he "didn't save any"—brought to light an unsettled ledger of favors spanning those four years. Zhao Deshun, a sanitation worker, had once eagerly helped the lamb soup shop shovel snow, move goods, and take out the trash, yet …