Chen Mu invests the 400,000 yuan down payment for his future marital home into a fishpond, building a fully enclosed, circulating-water "lake within a lake." His fiancée publicly throws down her engagement ring and breaks up with him, while a fisherman with 25 years of experience mocks him on a livestream, calling him a fool driven mad by studying. Unexpectedly, a once-in-a-century super blue-green algae bloom sweeps across the lake district, wiping out millions of jin of live fish overnight. Only his 50-mu fish farm remains crystal clear. His premium-grade sea bass sells for ten times the usual price, with cold-chain distributors lining up to buy. In the end, he establishes a cooperative, leads the entire village into technology-driven aquaculture, and finds true love with a like-minded aquatic specialist, using data to break free from the fate of depending on the weather.