Why did South Korea later change its capital to Seoul?

Seoul (?) is also known as Nanjing (?), Hanyang (?), and Beijing (?). After independence, it was renamed Seoul (translated as Seoul, Seoul), which means "capital".

The southeastern part of today's Seoul was once the capital of the Baekje Kingdom in ancient times. After the fall of Baekje, it was occupied by Silla, and its name was changed from Seoul to Hansanju and Hanyang County. During the Goryeo Dynasty, Hanyang was one of the "three minor capitals" besides Wangjing (Kaijing), which was Nanjing (the other two capitals were Gyeongju, Tokyo and Pyongyang, Xijing).

After Li Chenggui established the Lee Dynasty of Korea, he felt that Wang Jing of Goryeo (today’s Kaesong, Korea) was very weak, so Quan Zhonghe, Zheng Daozhuan and others selected a good place and started in 1392 A new capital was built in Hanyang, north of the Han River. It is surrounded by mountains and rivers, with Bukhansan Mountain and Bukaksan Mountain in the north, Naksan Mountain and Yongmasan Mountain in the east, Inwangsan Mountain in the west, Namsan Mountain and Gwanaksan Mountain in the south. The Han River surrounds the south of the city from east to west, forming a dragon, sand, water, The excellent Feng Shui pattern of the "landscape lapel belt" at the acupuncture point. A large amount of construction work was carried out in the city, including the construction of palaces, ancestral temples, government offices, and roads. In 1394, Li Chenggui moved the capital from Kaijing to Hanyang, officially naming it Hansung (?). During the Joseon Dynasty, Seoul was also called the "capital". During the Japanese occupation, the name of Seoul was changed to Kyeongseong (Kyeongseong, ?; Keijo, ?, けいじょ), and its status was also reduced from the Zhili Prefecture of the Central Government of North Korea to a county in Gyeonggi Province. After Korea became independent, the name of Seoul was changed to Seo-Ul (Seoul) in 1945.

It should be noted that Seoul means "capital" in Korean. The Seoul of Goguryeo is Pyongyang, the Seoul of Silla is Gyeongju, the Seoul of Goguryeo is Gaegyong (Kaesong), and the Seoul of the Joseon Dynasty is Seoul. It was not until after the liberation of Korea that Seoul was used as a fixed term specifically referring to Han Sung.