Why do Chinese characters appear in traditional Chinese in Korean books?

The traditional Chinese characters in Korean characters are the same as the radicals of Chinese characters in Japanese characters. They were brought back to China as states came to China during the Han and Tang Dynasties to pay tribute, pay tribute, study abroad, and learn about China's advanced culture and technology. Evolve and change it to form your own words and enrich your own language.

There is no need to make that kind of slogan, because they still can’t understand most of the traditional Chinese.