说韩国人小气怎么说英语

To say that a person from South Korea is "stingy" in English, you could say:
"He/She is really tight with money."
"He/She is very frugal."
"He/She is a bit of a penny-pincher."
It's important to note that it is generally not considered polite to label someone as stingy or characterize them based on stereotypes, regardless of their nationality. It's always better to focus on an individual's actions and behavior rather than making generalizations about a group of people.