Does Korea belong to China?

No, the sovereignty and territory of each country are independent and have no affiliation.

There is indeed a South Korea in history, but it is a vassal state in the Western Zhou and Warring States Period. It is different from Korea now, and the full name of Korea is the Republic of Korea.

South Korea, the full name of the Republic of Korea, referred to as South Korea or South Korea. Located in the south of the Korean Peninsula in East Asia, with a total area of about 654.38+ 10,000 square kilometers, the main ethnic group is Korean (Korean), and Korean is commonly used. The capital is Seoul (formerly known as Seoul). South Korea is surrounded by the sea on three sides, the Yellow Sea in the west, the Jiaodong Peninsula across the sea, the Korean Strait in the southeast, the Sea of Japan in the east, and North Korea across the demilitarized zone of the 38th parallel. The Korean peninsula was a vassal state of the Central Plains dynasty for a long time in history. At the end of the Qing Dynasty, China was defeated by the Japanese in the Sino-Japanese War of 1894-1895, and officially broke away from the vassal relationship with the Central Plains Dynasty. 19 10 The Korean Peninsula was formally incorporated into the territory of Japan and gained independence after World War II.