8-Year-old Lin Yue met 9-year-old Wu Hao and the equally immature Yang Yu, and the three have been inseparable since then. When 10-year-old Lin Yue met Ayayu, they didn't know that they would become such good friends in the future. When 13-year-old Lin Yue met Yin Jing, everything changed. Lin Yue experienced her first betrayal. At the age of 13, she finally saw the gray world through her best friend. Only Ling Yu is left with 16-year-old Lin Yue, Wu Hao has alienated her, and Yang Yu is not the same as before. Have you grown up after all? In this way, 18-year-old Lin Yue and 17-year-old Ayayu left this familiar place. But why is it that when 21-year-old Lin Yue meets Wu Hao again, her heart can no longer be settled?