This year, Chen Lixin is 24 years old and her children are in elementary school. When she returned from sending her children to school at noon, she saw an article posted by her best friend Lu Wenwen on Weibo. After clicking on it, starting from the first sentence, it seemed that the cells in the deepest memory that had gradually weakened began to become active again, and the past events and old people that she thought she had let go of came back to life. It was in my mind that in the autumn of 2010, Chen Lixin and her best friend Lu Wenwen, who had just entered high school, came to this strange school. The two girls, who were full of curiosity and excitement, did not know that the next three years here would be the most unforgettable three years in their lives. It was also at the last moment of these three years that a decision suddenly changed Chen Lixin's entire life. When Chen Lixin read this Weibo post, all her memories went back to ten years ago