The novel tells the love story between "I" (He Shengchen) and Ruan Yin, who only met once in junior high school. In the first grade of junior high school, I bumped into Ruan Yin because I was just riding a bicycle. I had a crush on her at that time, but they have never seen each other in the three years since then, even though they are paying attention to each other. By chance, I met Ruan Yin again in the first year of high school. This time, I wanted to take a chance. So I took the opportunity to get close to Ruan Yin. And my excuse is to find one person: Chen Wu. Chen Wu was my only good friend in junior high school, and he was also a witness to the car crash between Ruan Yin and me. However, Chen Wu's family misfortune made him withdrawn. When he was a freshman in high school, he left without saying goodbye, just because he didn't want to see his father, in order to resist his father's idea of reorganizing the family. Chen Wu always felt that his father was the murderer of his mother, so he was extremely indifferent and even hated his father. He would thwart everything his father did. After Ruan Yin and I found Chen Wu together, we discovered that Chen Wu had an extra sister: Ye Tong. Ye Tong is a well-behaved girl. Her biological father died in a flood, and she lives alone with her mother. She hopes that her mother will be happy, so Ye Tong has always hoped that Chen Wu can accept them as mother and daughter. Ye Tong turned to me for help, and I turned to Ruan Yin for help. Chen Wu, who had always liked Ruan Yin, followed the advice, and Ye Tong became Chen Wu's sister. Because Ye Tong always thought that I was helping her secretly, he had a crush on me, and I felt that Ye Tong was helpless and weak, so I cared about her very much. This made Ruan Yin dissatisfied. In the end, Ruan Yin fell in love with Chen Wu, and in order to forget the pain, I actually accepted Ye Tong...