Chen Qihang and Xu Wanning's family make a living by the sea. Starting from beachcombing and catching crabs, they go through low-price acquisition, setting up stalls to sell crabs, discovering a sea chart, exploring Old Crab Gulch, and catching lobsters. After a storm arrives, Chen Qihang leads everyone back safely, and heads to Black Stone Island to search for Xu Shaoan based on clues. In the end, the family reunites safely, making their days by the sea better and better step by step.