In the old society, children who were blind due to "smallpox" (measles) or other reasons, in order to survive, their parents sent them to apprenticeships to learn singing when they were just sensible. After completing his studies, he would travel from village to village to sing and make a living. ——This is the origin of storytelling. The most important thing for storytellers is stories. By playing the three strings, the storyteller will tell you about those strange things from ancient times to the present.