Whose youth is without regrets, and my regrets are related to you. Mo Xingxing's (played by Qiu Tian) family was broken after her mother died of "heroism". Since then, she has had to face her father's alcoholism, classmates' exclusion, and mental illness. Fortunately, she spent a beautiful and pleasant youth in the company of "Little Sun" Mi Sha (played by Bao Shangen) and warm senior Lu Li (played by Huang Minghao). But the thoughts of young people are always bitter. Inferiority and sensitivity push away love and protection. The gradually clear long line of fate also hints at the separation of this youth. At the end of the story, is it only the hourglass that remembers the time we have forgotten...