At Haihe Village, lots were drawn to divide the sea. Lu Chengzhou and his sister were schemed against by their uncle, being assigned the barren old stone beach that everyone despised. Just as the brother and sister were at their wits' end, he unexpectedly met a crab named A Jin who could speak the Tianjin dialect. Leading the way, A Jin helped Lu Chengzhou continuously capture wild green crabs to make his first pot of gold, and he also met a small pink octopus. Relying on the guidance of these two marine spirits, he kept finding precious seafood. Watching the brother and sister's days grow increasingly prosperous, their uncle's family was filled with jealousy and repeatedly came to their doorstep to pick fights.