Zhou Maisui, a modern agricultural product quality-control specialist, travels back in time to 1984. After having her engagement broken off and being forced into a family property division, all she gets is a worthless stretch of riverbank that floods every year and nobody wants. She joins forces with Shen Nanshan, a river embankment worker who has been suspended after being made a scapegoat, and the two embark on a business venture together. Using standardized techniques for grading, salting, and controlling salt levels, they produce red-yolk salted duck eggs with rich, flowing golden oil. Facing price manipulation, land-grabbing competitors, counterfeit products, malicious framing, and the threat of flood defenses collapsing, the two work together to overcome every crisis and clear their names. In the end, they establish a women's cooperative, help the entire village increase its income, and bring Li River's red-yolk eggs to markets across the province.