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This is the story of a family, or more accurately, it should be the story of two people, the story of the old man and her granddaughter. The old man accompanies his granddaughter, and the granddaughter protects the old man. It does not mean that they are dependent on each other, but that the bond between them is very deep. The old man's children are very filial, and his granddaughter's family is very happy. In his later years, the old man should have had the deepest bond with his children... During her free age, what did the granddaughter lose, what did she experience, and what did she gain to have a strong bond with the old man? What gives her a rainbow that other peers can't get? What kind of secret makes my granddaughter feel heartbroken every time she thinks about it? In the end, what kind of taste did the old man leave for his granddaughter, and made the girl shed tears of longing?