In the summer of 1981, Jiang Yulan struggles to make ends meet while raising her four sons alone in Dajin Fishing Village, frequently enduring harassment from her husband's elder brother's wife. One day, the children find a well-behaved little girl, Jiang Xiaobei, by the river and take her in. Xiaobei seems to be blessed with good fortune, always bringing unexpected surprises. Seizing the opportunity, Jiang Yulan separates her household from the extended family. With the lucky opportunities Xiaobei brings, the family works hard and gradually improves their lives, builds a new house, and starts a seafood business. Kindhearted and warm toward others, they even take in fellow villagers during a typhoon. Their days grow increasingly prosperous, and after enduring hardship, happiness finally comes their way.