On the first day of her second year of high school, transfer student Su Wanxing ran into Jiang Yubai's arms at the corner of the corridor. The "Five-Year College Entrance Examination and Three-Year Simulation" she held in her arms was scattered all over the floor, which also shattered her thoughts that she had hidden for two years - this boy in a white shirt with a red string on his wrist was the "white-shirt senior" she missed at the summer camp two years ago.
What she thought was the beginning of a two-way journey, Su Wanxing discovered that Jiang Yubai was gentle to everyone, but was deliberately alienated from her. She secretly drew his profile all over her notebook, handed him iced mineral water when he was playing ball, and silently left warm milk when he stayed up late reviewing, but she only received a polite "thank you" from him.
It wasn't until an accident occurred that Su Wanxing blocked Jiang Yubai's out-of-control bicycle and heard his crying cry before he fell into coma. Then he realized that his alienation was never hate, but a misunderstanding at the summer camp two years ago that made him think that she already belonged to him.
The misunderstanding was solved, and the sunlight shone through the classroom window on the two people's clasped hands. From late nights studying together to walking side by side on the playground, from school uniforms to wedding dresses, Su Wanxing finally understood that the most beautiful youth is when the love hidden in the heart becomes a lifelong companionship.