This is related to looking at the entire history of Korea, let alone starting from the Lee Dynasty of Korea established in the 14th century. At that time, the Korean Peninsula was a unified country. The Lee Dynasty successively moved to China. The Ming and Qing dynasties were proclaimed vassals until they were annexed by Japan in the early 20th century. During the Lee Dynasty of Korea, the first capital of North Korea was in Seoul, which was called Wangjing at the time. Pyongyang was only an important city in North Korea. During the Sino-Japanese War of 1894-1894, North Korea was still under the rule of Lee. During the Han Dynasty, Japan had not yet annexed North Korea, so the capital of North Korea was still Wangjing (Seoul, now Seoul). Later, after Japan's defeat and surrender in World War II, Kim Il-sung in the north of the Korean Peninsula and Syngman Rhee in the south established two separate The country had its capitals Pyongyang and Seoul respectively. Seoul was renamed Seoul in 2005.