The man and the woman are going to break up, and the woman is still very nostalgic. She rationally understands that "everything has an end" and that love is not eternal, but she still deludes herself and refuses to let go. After all, there are so many beautiful things that have not been experienced together, so she wants to wait for the boy to look back, hoping that the boy will understand that it is unremarkable after missing the flowers, and the long-flowing water is the real happiness.