Yang Weiyun, 74, opened a "classroom without walls" on a short video live streaming platform to teach everyone pinyin. The live broadcast room has poured into tens of thousands of viewers.

The number of illiterate adults in the country is close to 3800 million, according to the seventh national census in 2020. "Many of them live in inferiority, dare not go to strange places, and have difficulty communicating at work," says Yang WeiyUn. "There is a mother in Yang Weyun's live broadcast, because she is illiterate, and she does not dare to speak when she meets people"