The earliest dynasty in Korea was Jizi Korea, and Ji Zi was Shang Zhouwang's uncle. This man was found in Romance of the Gods. After the collapse of Shang Dynasty, he fled to the Korean Peninsula to establish a country, and later Zhou Wuwang named him Marquis of Korea.
Wei Man is a native of Yan State. He took some refugees from Yan State and Zhao State to South Korea to be an official. Later, he seized power and established Wei Man Korea (or Wei Man Korea) until Emperor Wu of the Han Dynasty crusaded and wiped him out, and set up four counties in Liaodong. In the meantime, it remains the territory of China.
After the Han Dynasty, some indigenous people in the southern part of the Korean Peninsula began to absorb the advanced culture of the Han nationality and developed and established a country. As it happens, a Koguryo nationality of Fuyu nationality in northeast China established the country, hit the Korean peninsula and moved its capital to Pyongyang. It became the Three Kingdoms period in Korean history. The other two countries are Baekje and Silla.
In the Tang Dynasty, Goguryeo, as a vassal state of the Tang Dynasty (the other two were also vassal states of the Tang Dynasty), disobeyed the Tang Dynasty and attacked Silla. Baekje also took the opportunity to occupy Silla's land. Silla asked the Tang Dynasty for help, so the Tang and Luo allied forces destroyed Baekje and Goguryeo. At this time, Silla's unification of the Korean peninsula was only a part of the territory occupied by Silla, Baekje and Koguryo in the south-central part of the Korean peninsula. The north still belongs to China.
The North and South of the Korean Peninsula have been divided for more than 60 years, and reunification has always been the goal emphasized by the North and South Korean authorities. The DPRK and the ROK respectively emphasized their respective principled positions on the issue of reunification.
From the standpoint, the two sides have differences on the unified plan. South Korea hopes to establish a unified country with a high degree of closeness. North Korea's main appeal for the reunification of the peninsula is the establishment of a "Democratic Republic of Korea", which is characterized by the establishment of a relatively loose federal state, so that both North and South enjoy independent jurisdiction and autonomy. North Korea insists that this plan points out "the most correct direction and way" for reunification.
Extended data:
North Korea was elected by all the people in the north and the left in the south, while South Korea was established with the support of most reactionary forces such as the United States and the old military police, and slaughtered a large number of progressives after its establishment. Including Jin Jiu, the "father of Korea".
There is no confrontation between North Korea and South Korea in history. According to the main population sources in the history of North and South, the relationship between the two sides should be: the North belongs to China and the South belongs to North Korea.
From the recent visit of a high-level DPRK delegation led by Huang Bing, the second commander of the Korean People's Army, it can be seen that the DPRK is sincere in dialogue and truly willing to promote the improvement of North-South relations. However, the positions of the DPRK and the ROK on the issue of reunification are quite different, and the South Korean government recently indicated that it will not change its policy toward the DPRK. How to further promote the North-South dialogue is a more serious issue.
References:
People's Daily Online-Subtle DPRK-ROK Relations