Classic of Yangma River

When I was riding home at noon, I suddenly thought that the changes in society were not the affairs of a few teachers. Since it was a simple and straightforward story, there was no earth-shattering incident, no great love, and it was all trivial matters, why not take a broader view?

Therefore, I decided to start my story from three clues. One was the growth of a teacher, one was the change of family, and the last was the development of friendship between classmates.