Puey Ungpakorn is a person who lived in Thailand a long time ago. He was a very important man and did many different things to help his country. He was a professor, which means he taught people things at a school. One of the things he taught was how to manage money. He also worked for the government to help make decisions about how to make Thailand a better place for people to live.
Puey Ungpakorn was very smart and cared a lot about the people in Thailand. But sometimes, when people are in charge, they make choices that some people don't like. This happened to Puey. The government didn't like some of the things he said and did, so they said he couldn't come back to Thailand. He had to leave his job and his friends and go live in another country.
Even though Puey Ungpakorn had to leave Thailand, many people still think he was a great man who helped make Thailand a better place. They remember him for all the good things he did, and they talk about him and try to keep his memory alive.