Jiang Yukuo, an introverted boy with low self-esteem, met Lin Zhixu, a sunny and cheerful girl, because of an accident when he was fifteen years old.
Later, after the start of the third grade of junior high school, they discovered that they were assigned to the same class. Later, the class was transferred and they became the front and back desk. Jiang Yukuo was slowly attracted by Lin Zhixu's sunny and cheerful personality.
Lin Zhixu's sunny cheerfulness slowly infected Jiang Yukuo, making her lose her introverted and inferior character, and also made Jiang Yukuo no longer feel cold in the winter of his third year of junior high school.
What Jiang Yukuo didn't know was that he had unknowingly fallen in love with this sunny and cheerful girl. However, when it came to love, Jiang Yukuo found it difficult to talk about it due to the youthful youth of adolescent boys and girls, which made him hide this love deep in his heart.
Later, Jiang Yukuo and Lin Zhixu drifted apart due to some misunderstandings and another transfer. After graduating from the third grade of junior high school, Lin Zhixu moved out of the new city due to family changes. The only thing left for Jiang Yukuo was the maze ruler they played with throughout the third grade of junior high school.
Later, Jiang Yukuo studied hard in high school and was admitted to Chongqing University, which Lin Zhixu had wanted to attend. During the four years of college, he always carried that ruler with him, but he failed to find Lin Zhixu.
During the four years of college, Jiang Yukuo still studied hard and was finally admitted to Peking University as a graduate student.
Jiang Yukuo learned about Lin Zhixu again when his friend Jiang Qi told him that Lin Zhixu was getting married.
The beautiful memories under the window sill in the third year of junior high school will forever become Jiang Yukuo's secret.
Intention: We will encounter many things in our youth, but this is not a reason to stop us from moving forward.