The protagonist is fifteen-year-old An Li who is immature in many aspects, and she knew that she was adopted by the famous writer Qin Yuxi at a very young age. After being together for ten years, the two developed a deep relationship. However, during the summer vacation when An Li was fifteen, Qin Yuxi died of illness. An Li, who had always had problems in life and emotions, suddenly became helpless, anxious, and closed himself off. But soon after, he received the notebook and other items left by Qin Yuxi during his lifetime. Qin Yuxi wrote down Qin Yuxi's different childhood in that thick notebook. Qin Yuxi wrote: An Li gradually found herself through Qin Yuxi's stories, and she also became good friends with Qin Yuxi's book fan Rao Zitong. Just when everything was about to return to its original track, An Li's parents came back to look for her, and she fell into confusion again... Everyone, each is a world. In a person's world, many people come and go, how many people can leave traces, and who will stay with you until the end? This is a world with different emotions and colors. Some parts are so fragile, and some parts are as hard as iron.