At the age of eighteen, Du Ruo came to Beijiang City to study at university. At the age of twenty-five, an accident caused her to leave the city where she had lived for seven years. She never thought that what would make her return to Beijiang three years later would be the death of her best friend Xu Lina from college... This was a journey of farewell and a journey of retrospection. Old things still appear in front of us, and the past is spread out layer by layer in the memories. What is it that makes the youth that was once as bright as summer flowers scattered all over the place? What caused Xu Lina's death? The truth is that he will meet his former self in Beijiang. And where should Du Ruo go now?