At a storm-lashed harbor, a pregnant flood dragon is gravely injured by heavenly lightning and falls into a fishing net. Qin Haijun, a seafood industry manager, remains true to his principles and upholds ancient teachings. Despite his subordinates Zhang Jianguo and his wife wanting to skin the dragon for profit, he insists on releasing it and protecting it until it is safe. Grateful for his kindness, the dragon promises to repay his debt. Zhang Jianguo secretly commits major crimes involving illegal fishing and smuggling. Out of consideration for their long-standing relationship, Qin Haijun takes the blame, entrusting his family and business to Zhang. But Zhang soon reveals his true nature, mistreating Qin Haijun's daughter and plotting to seize the Qin family's assets. In the end, kindness is rewarded. Faced with betrayal, Qin Haijun upholds justice by staying true to his principles, demonstrating the value of compassion and responsibility.