Many times, when we are afraid of something we will experience, we always move forward stubbornly and cannot bear to look back. I thought that as long as I moved forward, everything would pass. However, only when we truly look back at the past can we truly bid farewell to the past that only carries the warmth that only we can feel, and we will have a new and better version of ourselves. . Xia Ying, a girl with eyes like a crescent moon when she smiles, experienced an unforgettable love affair with her first boyfriend Ding Zijun when she was a teenager. She once regarded it as her whole longing for future life. However, as they spent time together, she discovered that Ding Zijun had been hovering between her and another girl, swinging and unable to extricate herself. After years of separation and reunification, Xia Ying left with complete determination and went to university in the distant city of N. In the following years, boys and girls kept showing interest in her, but she could not get rid of the trauma caused by the past and did things that hurt herself and others again and again. . Her friend Lin Manyu was in pain and unable to breathe after she had been secretly in love and waiting for Ye Bei, her first love boy, for more than ten years. Finally, she waited for the news of his marriage to someone else. . No one knows how they will deal with the past. .