Not everything is ok, it depends on the level of people. But they all know a little, and they can use a few common words. In the past, Chinese and Korean were written together in Korea, but in order to protect their own national characters, it was banned several years ago, but the Chinese character culture is deeply rooted in Korea and cannot be banned. In recent years, the government has also begun to promote the use of Chinese characters. Many Korean newspapers have Chinese characters and TV programs.

I have a book of Yonsei University with the signature of its president, which is China's calligraphy. It's very good!