Lin Qiang spends 300,000 yuan on three generators just before a citywide blackout. His fiancée, Xiaoya, angrily leaves him, while his rival, Zhao Biao, laughs at him for being foolish. On the sweltering night when the power is forcibly cut, all 20,000 jin of Zhao Biao's live shrimp perish, but Lin Qiang's stock remains completely unharmed. Refusing to exploit the crisis by raising prices, Lin Qiang instead keeps supplying his neighbors at the original prices, guarantees Zhao Biao's debts, and takes the lead in establishing an honest seafood business alliance. When Xiaoya returns, she sees that he is no longer the "crazy fool" she once knew, but the man the entire street depends on. Blackouts come and go, but the rules built on integrity can illuminate a street's business for years to come.