Korean names are in Chinese characters, and Korean is in Pinyin. How do they correspond to Chinese characters one-to-one?

The first people to establish North Korea were the Chinese immigrants, and the Chinese-Han people immigrated to North Korea for a long time.

So the Koreans are actually a branch of the Chinese-Han people.

So they use Chinese-Han culture.

Of course you have to use Chinese characters.

But most North Koreans are illiterate, and only a few intellectuals know Chinese characters.

So a Korean king invented Hanyu Pinyin to help illiterate people learn Chinese characters. This pinyin is called "Xunminzhengyin". Also called "Proverbs".

After World War II, Korea split.

North Korea abolished Chinese characters and only used "Hyun";

South Korea abolished Chinese characters in the 1970s and also used "Hyun".

But people’s names still use Chinese characters, and this habit cannot be changed.