Xu Siyi, who was involved in an accident years ago, was adopted by an overseas family and grew up to become an outstanding corporate executive. After recovering her lost memories, she returns to her homeland to find her three sisters, only to discover that outsiders have disrupted her family and that each of her younger sisters is trapped in difficult circumstances. She carefully rescues her second sister from danger and helps her youngest sister recognize the truth. Using her own abilities and resources, she foils the villains' schemes to seize the family fortune and ensures that those responsible are dealt with according to the law. After an extensive search, she finally reunites with her long-lost third sister. The four sisters are reunited at last, and together they protect their family business and fulfill the promise they made to their late mother.