Twice. 123 1 year, during the Korean-Mongolian War, korean king fled to Jianghua Island; 1258, Cui regime collapsed, the king surrendered to Mongolia, and Mongolia promised to withdraw its troops. After the establishment of the Yuan Dynasty, Sanbie Copy, which refused to lower the Yuan Dynasty, continued to wage an anti-Yuan war. 1273, the Yuan Army occupied Jeju Island and the Korean-Mongolian War ended. Korea became a vassal state of the Yuan Dynasty, and it was not until 1356 that the Korean court regained its sovereignty. 1904, after the Russo-Japanese War, Russia was defeated and the Korean regime was completely controlled by Japan. 1905, the Treaty for the Protection of Japan was signed, and North Korea became Japan's "protectorate". 1906, Japan established a "unified supervision" regime dispatched by Japan in North Korea. 1907, Japan forced Emperor Gaozong to abdicate and was succeeded by the Crown Prince. 1909, the first governor of Japan, Ito Bowen, was stabbed to death by North Korean patriot An Zhonggen in Harbin. 19 10 In August, Japan forced the Korean Empire to sign the Japan-South Korea Merger Treaty with it, formally annexed the Korean Peninsula, and established the Korean Governor's Office for colonial rule. Japan made the royal family of the Korean Empire a Japanese aristocrat, forced Gaozong to abdicate and established the pure Sect of Korea.