The story takes place in Qingsha Bay in the 1980s and revolves around the protection of marine resources. Lu Chaosheng leads the fishing village residents in fighting local powers that seize maritime waters and recklessly discharge pollutants, defending the blue homeland on which their community depends for survival. Shen Zhiyu puts down roots in the countryside and uses her professional expertise to support the people's fight for their rights. Together, they gather evidence and stand united in resistance, opposing exploitative development and protecting the tidal flats and fishing grounds. The story celebrates the spirit of collective struggle, portrays ordinary people safeguarding marine ecology and defending their community's rights, and tells a moving tale of rural people who remain upright and unyielding in the face of their times.