The story begins with 14-year-old Chu Xiyue falling in love with 15-year-old Lin Zeheng, but the boy's disgust and repeated rejections made her shrink back.
"Lin Zeheng, I don't like you anymore. I'm going to move forward. I'm no longer the Chu Xiyue who will only be behind you. I once thought that you don't need a reason to like someone, but you need to love someone. Maybe... I just like you. Later I discovered that whether I like you, whether we are together or not, and whether we get married or not are three completely unrelated questions. On that unknown night, the number 12 belongs only to me. It belongs to me alone."
"Lin Zeheng, I wish you and I a bright future and we will never see each other again."
She is the one who likes summer, and she is the one who dislikes summer.
Everyone can be happy... Except Chu Xiyue...
Concept: Who has no regrets in their youth? Go forward