Fifty-two-year-old Zhou Guifen guards a conscientious stove in the electronic factory cafeteria. Faced with overnight food, bad meat, and low-price competition, she steadfastly maintains that workers' stomachs are not tools to save costs. Fired, harassed, and having her orders snatched, she never changes her original intention. Starting from fifteen lunch boxes, relying on fresh ingredients, generous portions, and timely delivery, she regains the workers' trust. Ultimately, she secures the night shift meal order and guards the simplest dignity of an ordinary laborer. The food must be hot, the heart must be upright, and no matter how difficult the days are, one never trades other people's health for money.