The first stage was the Tang Dynasty. With the conquest of Baekje in the Tang Dynasty, the influence of Chinese civilization on Korea is increasing day by day. During this period, North Korea imported a large number of scientific, cultural and religious books and technologies from China. Through the tributary system, people are sent to China to study. This is the beginning of China's contact with North Korea.
The second stage is the Yuan Dynasty. However, this stage was not voluntary at first. But because of fear of the violent destructive power of Mongolian soldiers.
In order to preserve the state system, korean king automatically joined the vassal state system of the Yuan Dynasty and made every effort for the second Mongolian conquest of Japan. In order to win over and control North Korea, the Yuan Dynasty also won over korean king through marriage. This method has achieved great results. For a long time, the clothes and houses of North Korean nobles have deliberately imitated Mongolian style, and living tents have become popular. This can be seen in Korean modern costume movies.
The third stage is the Ming Dynasty. This stage is a period of comprehensive China of North Korea, and it is also a period when China has the greatest influence on North Korea. North Korea copied almost all the systems and classics of China intact. Known as "Little China". The rituals of modern Koreans are almost all the remains of Ming Dynasty costumes.