On his birthday, Hu Luming buys a grass carp, only to face complaints from his family. His wife believes their daily expenses should be kept tighter, while his son is consumed by anxiety over the down payment for his future marital home. Conflicts erupt throughout the family. After an argument, Hu Luming leaves home alone on a rainy night. With nowhere else to turn, he picks up his plumbing and electrical trade again, working diligently and building his career through exceptional skills and a commitment to honesty. Step by step, he becomes a well-known building materials businessman in the industry.