? Chen Pan: The top student in science in class 3 of the second grade of high school. He is very partial to subjects (mathematics, physics and chemistry are always at the forefront of the grade, and he struggles to pass the Chinese language test). He has a cold and taciturn personality. He always immerses himself in solving problems during class. The cuffs of his school uniform are always rolled up to his forearm. On his left wrist, he wears an old electronic watch given by his grandmother before she was born. He may seem distant, but in fact he will silently help his classmates sort out their science ideas, but his tone is as straightforward as "problem-solving steps" and he is not good at expressing emotions.
? Qiu Xing: A physical education student in Class 1, Grade 2, who specializes in 800-meter long-distance running. She wears a high ponytail and her sneakers are always stained with grass clippings from the playground. Her personality is as lively as a little sun. She loves to help the teacher move sports equipment and stuffs fruit candies with classmates who have hypoglycemia after training. However, because she is always at the bottom of the math score, she is arranged by the class teacher for "special tutoring".
Purpose: It is based on the youth time symbolized by the "cicada" as the background, using the academic difficulties represented by the "root number" and the growth challenges carried by the "runway" to explore the confusion, struggle and self-reconciliation of teenagers in adolescence, and to show the dual trajectories of knowledge exploration and physical and mental growth in youth.