在英语中，韩国人的正式说法是"Korean person"或"person from South Korea"。这个说法的来源很容易理解，因为"Korean"是用来描述韩国的人、语言和文化的词，而"South Korea"是韩国的正式国名。

例句：

She is a Korean person.

He is a person from South Korea.

I met a lot of interesting Korean people when I visited Seoul last year.

My best friend is from South Korea and she teaches me a lot about her culture.