This is a love story in a small town in the south of the Yangtze River. It is very simple and pure. Originally, like other couples in the town, they could stay together until old age! However, Zhang Fan, who was not willing to stay in this small town forever, chose to stay in a big city and work hard after graduating from university. Xia Tong, who originally wanted to return to his hometown and become a middle school teacher, also stayed with him in S city. Realistic problems have cast a veil over their original pure love. They both want to keep the good things, and they have made efforts, but it depends on God's will whether the outcome goes as they wish. No matter how bad the result is, at least I still have the memories of my youth. Many years later, when the sun sets and I recall it, I will smile knowingly! If it can end happily and grow old together with your son, then what happened before will be a highlight in the ordinary and fleeting years in the future.••••••