Chen Mingyuan, a youth rooted in a southern water town, carries the initial aspiration to protect his hometown, and returns to his native land to take over the unfinished crab farming career of the older generation. Facing severe difficulties such as deteriorating crab pond water quality, villagers' doubts, and capital shortages, he never spoke lightly of giving up. With the help of Zhou Daoxiang, an agricultural science academy technician, and Sun Qinglian, a rural planner, Chen Mingyuan delves into water source management, improves farming models, and solves ecological farming challenges. Older villagers like Liu Shougen go from watching on the sidelines to understanding, bridging the gap between two generations and joining hands to overcome hardships. They protect a region of local soil and water, revitalize rural aquatic resources, and turn the small mud crab into the hope of rural revitalization.