In Korea, what language is code written in?

Hello! This is a question for those who are very interested in coding. Many people wonder if code and syntax are written in English when coding in Korea. In fact, most programming languages are based on English, so they use the same grammar and structure worldwide. However, comments, variable names, and function names can be written in Korean. So, what basic knowledge should a foreign developer who is not a native Korean speaker have when they want to learn coding in Korea? First, it is important to become familiar with English, as the basic grammar and structure of programming languages are in English. Additionally, the ability to read and understand technical documents written in Korean will also be necessary. If anyone has related experiences or specific examples to share, it would be very helpful. I look forward to your opinions!