The story between Qiuyang and art teacher Pei Yufang. Qiuyang is a student of art teacher Pei Yufang in junior high school. Since Qiuyang was about to graduate, his teacher was transferred to another city, and they lost contact. Later Qiuyang went to Shanghai to develop, and one day they met by chance at an art exhibition... This book tells the story of the joys and sorrows of small people who make mistakes in metropolitan life. Faced with the error codes given by the previous generation, what choices should they make, and what kind of future will they have?