Su Xiaotang's 17-year-old life has become a "memory roller coaster" - one second she was discussing with her best friends where to drink milk tea on the weekend, and the next second she forgot what she just said; the English words she had just memorized were as if she had never seen them before when she closed the book; even the "time capsule" buried under the old locust tree with the bamboo horse Lin Yuchuan when she was a child, the details were blurred as if they were mosaic. The teacher said that her "mind wandered into outer space", and her classmates teased her that "the memory of fish lasts longer than yours." Only Su Xiaotang knew that those disappeared memories seemed to be secretly "cut away" by something in her dreams.
Until Lin Yuchuan, a bamboo horse who disappeared for five years, suddenly returned, everything began to deviate from the script of "ordinary high school students". This boy who always wears a washed-white denim jacket with an old red string tied around his wrist can always tell her accurately when she can't find something: "Your physics notes are in the drawer in the last row of the classroom, sandwiched in the "Five-year College Entrance Exam Three-Year Simulation" and "The hairpin you lost fell in the ivy bush on the back wall of the school." What shocked Su Xiaotang even more was that she accidentally saw Lin Yuchuan in her dream, using the old red rope to "fish" out a shimmering fragment from the air - the moment the fragment entered her mind, she suddenly remembered the graffiti she and Lin Yuchuan had drawn under the old locust tree when she was a child.
