Administrative procurement supervisor Lu Yuan is publicly scolded by shop owner Wang Cuihua at an old restaurant for adding vinegar, and also discovers the shop is using inferior ingredients like synthetic meat and blended vinegar. Lu Yuan cancels their corporate group meal order according to regulations, supporting a new shop that uses solid, genuine ingredients. Wang Cuihua grows resentful, repeatedly making malicious reports and kicking up a fuss, and is ultimately investigated and penalized for food safety violations. The story showcases market game theory, interpreting that doing business values adhering to conscience and integrity above all.