On the first day of the second year of high school, transfer student Su Wan ran into the arms of Lu Xingci, the top student in grade, carrying a half-used drawing board, and paint splashed all over his white shirt - this was the beginning of their story. Su Wan transferred to another school with the secret of her mother's remarriage. She was taciturn but always sketched the boy's profile on the drawing board. Lu Xingci was the perfect role model in the eyes of the teacher, but when he saw Su Wan hiding under a locust tree and secretly feeding stray cats, he discovered the softness under her cold appearance. From quietly passing notes in class, walking side by side after evening self-study, to working on questions late into the night for a common goal, the two redeemed each other in their youthful time. Su Wan helped Lu Xingci resolve the gap with his father, while Lu Xingci protected Su Wan's dream of painting. When the summer cicada rang for the third time and the bell rang for the end of the college entrance examination, they confessed their love under the locust tree where they had fed cats together and agreed to continue writing the chapter at the university in the same city. The full text is sweet and non-cruel, hiding school uniforms, test papers, ice sodas and the purest heartbeats of boys and girls.