Jiang Yu mastered his family's legendary art of reading the sea from an early age, allowing him to discern tides, identify hidden reefs, and predict storms. Faced with the predicament of having his family's ancestral home occupied by others, he refuses to give in to despair. Instead, he relies on his exceptional skills to retrieve precious fishing crates from the dangerous waters of Black Reef Bay, earning the trust of the entire harbor. From then on, he freely teaches fellow villagers how to navigate safely and leads independent fishermen in establishing a cooperative. By organizing their fishing and sales collectively, he completely overturns the situation in which they were once forced to accept unfairly low prices. He also helps chart brand-new sea routes, dramatically reducing maritime accidents.