In a small county town, the girl Xia An began her high school life. For a certain period of time, she lived a happy life and had an excellent and handsome classmate. Unfortunately, she didn't know what liking was at that time and thought it was just dependence. After a change occurred in her family, and after learning that happiness is the greatest coincidence in the world, she changed a lot. Can the separated people meet again? Can broken relationships be mended? Can the lost good times come back? In the face of time, we in adolescence know nothing, so we have to move forward, and let the past become a kind nostalgia, so that when we recall it many years later, it will be like a gilded good time.