Lu Heng is an outer-sect handyman. When the spring famine leaves the kitchen out of food, relying on a panel that can display three-day shortages and inventory, he screens moldy grain and allocates according to demand, stabilizing the food shortage first. This action threatens the cake of the old powers led by Cang Cao. Cang Cao insists that the granary is in his hands and the rules are what he says, using privileged fleets, falsely reporting losses, and withholding rain tarpaulins to manufacture shortages, framing Lu Heng for it. Step by step, Lu Heng spreads out the data, first slapping Cang Cao in the face with loss comparisons, then investigating and exposing the secret granaries moving grain, and finally establishing a delivery order system, turning shortages into auditable accounts.