At the construction site entrance, Zhao Mingyuan has barely opened his ten-yuan lunch box business when he comes up against Old Chen's twenty-yuan-per-meal offering, advertised as “Eat Without Heartburn.” Zhao Mingyuan sells his meals cheaper and serves them faster, so the orders keep pouring in. Meanwhile, Old Chen sticks to the same old lines: “Rules must not be broken.” “What do we do with the leftovers? Throw them away.” “Should we buy more meat tomorrow? No, let's take it slowly.” “Things are finally getting better. Yes, we need to stay steady.” As the ten-yuan lunch boxes grow more and more popular, the supposedly heartburn-free business finds itself increasingly troubled. Customers dwindle, leftovers pile up, and Old Chen continues clinging to his own rules. Eventually, his business philosophy fails to keep up with the market, and the business shuts down completely.