Fisherman Xu Dahai and his family live near the sea and make a living by gathering seafood, but they face malicious suppression from local merchant Wang Jinya, who seizes fishing spots, cuts off transportation channels, and uses improper means to interfere with their business. Xu Dahai unites the villagers, adheres to the principle of fair trade, and resolves crises by relying on evidence and rules when things happen. Everyone unites and cooperates, improving the whole process of fishing, sorting, and transportation, opening up multiple supply and sales routes, and relying on hard work and integrity to forge a path of livelihood belonging to everyone.