Ask for a brief introduction of Ma Lao, Mr. Cao and Si Liu in Camel Xiangzi (with characters experience and the ending or ending)

1. Er Hadron: He is a driver who gives up on himself. He sold his daughter, bought a car and enjoyed himself for a while. When the money ran out, he lost his temper by drinking at home. As a result, he killed his wife, sold the car and started pulling again. He is drunk every day, regardless of the two children at home. After her daughter came back, she forced her daughter to sell herself to support her family. She often goes home to ask her for money, and when she asks for money, she gets drunk. 2. Ma Lao: He is a kind and helpful person. Is a person who submit to humiliation; He was a coachman, strong all his life, but in the end he couldn't even save his little grandson. Therefore, Ma Lao can be the representative of the lowest level. 3. Grandpa Si Liu: 69 years old. People and car owners are very demanding. Xiangzi's employer. Paoge, a figure in the old society, improved and set up a parking lot. He is an honest and frank man with a strong personality and never refuses to lose face in the outfield. 4. Teacher Cao: An ordinary teacher, who loves traditional art and is tolerant of others because he believes in socialism, is regarded as a "saint" by Xiangzi.