Twenty-five-year-old Cheng Shuli accidentally discovered the diary of a classmate who knew each other but had no intersection in high school during a job. Standing now, groping through the yellowed pages of the book, recalling their youth as a bystander, I feel the delicate and obscure emotions that were difficult to detect in the past, and the tingling touch in my heart. Gradually, he discovered that this might be more than just a confession between two people who had a crush on each other. Write about them, write about me, write about everyone in the green years