Lu Ze, a top engineer, gives up his lucrative career and returns to his hometown to build an ecological seaweed reef in Coldwater Bay, issuing an early warning about a deadly toxic red tide. Jealous of his achievements, his cousin Sun Hao incites the entire village to jointly report him for occupying public waterways, forcing him to sign a life-or-death agreement to dismantle the protective barrier that could save their lives. Sun Hao recklessly dumps strong alkali into the water to accelerate growth, directly triggering the red tide. Overnight, the entire village loses its aquaculture harvest. Instead of accepting responsibility, they turn around and demand that Lu Ze pay compensation. Meanwhile, Lu Ze uses his micro-electrolysis iron wall system to protect his black gold abalone, secures an exclusive major contract from the provincial capital, and ultimately establishes an ecological cooperative, leading Coldwater Bay to a complete turnaround.