How did the Kong and Liu surnames in Korea and North Korea come from, and who were their ancestors?

Since the Yuan Dynasty, people from the Confucian school began to migrate overseas. At that time, the supreme ruler of the Yuan Dynasty adopted the marriage policy to control Korea. In the ninth year of Zheng Zheng (1349), Princess Cheng Yi married Zhuan Wang, the son of korean king Suzhong, and Kong Zhao, a descendant of Confucius, was one of the princess's attendants. After arriving in North Korea, Kong Zhao was re-used by korean king, ranking as assistant minister, the same as Pingzhang (equivalent to the post of prime minister). He was named Suiyuan Jun and Changyuan Jun successively, and was buried in Changyuan after his death.

Confucius' genealogy

The descendants of Kong Zhao have been an official in North Korea for generations. His son Kong Tang went to the University Jixian Hall with Pingzhang, his eldest grandson went to the official judge Yin, and his second grandson went to the assistant minister with Kong Zhao. So far, two of Kong's three generations have served as prime ministers of the Korean dynasty. Later generations multiplied and celebrities came forth in large numbers, becoming a noble family in southern Korea. Because the tomb of their ancestor Kong Zhao is in Changyuan, they regard Changyuan as their birthplace. The emperor of the Koryo dynasty worshiped Confucianism and gave preferential treatment to Confucius and grandchildren. In the 16th year of Korea's authentic reign (1792), the king inquired about Qufu's family tree, and ordered Koryo's Confucius to take Qufu as his native place, so as to show that he would not forget his ancestors, follow the example of China's feast duke and make him a Spyker. The Kong family in Korea has been bred for 86 generations. Their names are different from the domestic rules in China, and they also have a set of Chinese characters for generations. In South Korea, there is also a special Confucian clan organization called "Qufu Kongshi Korea Fair" to show that it originated in Qufu, China. In the 1980s, a delegation made a special trip to Qufu to worship their ancestors, and erected a monument outside Yangshengmen (that is, the north gate of Qufu) to commemorate them.