It had just rained, and the sky was cold and white. Students in twos and threes passed them and ran towards the distant smoke. He yelled at them, "Teacher Du, goodbye!" "Teacher Du, let's go!" Then he ran away with a smile. Du Yu was silent, looking at each other from a distance more than ten meters away from Xing Le. Xingle looked at him. He was wearing the same pure white shirt as before and was as thin as a new bamboo. But there are thousands of clouds and mountains, thousands of miles of travel, and countless unbearable days and nights between us. Two children were wasted and turned into a man with a vicissitude of heart. "Du Yu." Xing Le murmured, his throat choked with sobs, and his hoarse voice was difficult for even him to distinguish. When Du Yu saw his lips opening and closing, he turned around and started running. The tears I had endured for many years were splashed on the gravel road. The clouds and mountains are heavy, and the heart is thousands of miles away. In the long time, the most powerful thing I have ever seen is the lost love of young people.