Finally understand why the South Korean flag looks like a bagua.

Everyone can look up 'Joseon Dynasty' on Baidu (the Joseon Dynasty was the predecessor of present-day South Korea and North Korea). From the Goryeo period (10th century AD), Joseon was a vassal state of the Yuan Dynasty. In 1392, General Yi Seong-gye of Goryeo seized power through a coup, and in 1401, his son Yi Bang-won was conferred the title of Grand King of Joseon by the Ming Dynasty, becoming a tributary state of Ming. The dynasty implemented policies that promoted Confucianism and suppressed Buddhism, and adopted a policy of deference towards China (the national flag was the Eight Trigrams flag). In 1636, the Later Jin invaded Joseon, and King Injo surrendered, switching tribute allegiance to the Qing Dynasty. In 1876, Japanese warships entered the mouth of the Han River, signing the unequal 'Treaty of Ganghwa,' opening the gates of Joseon to Japan. After losing the First Sino-Japanese War, the Qing Dynasty was forced to relinquish suzerainty over Joseon (otherwise the entire Korean Peninsula would be Chinese territory today). In 1896, King Gojong of Joseon declared himself emperor and changed the country's name to the Korean Empire (the national flag was the Taegukgi, similar to the current South Korean Taegukgi, estimated to be the predecessor of the Republic of Korea, commonly called South Korea). In August 1910, Japan annexed the Korean Peninsula through the 'Japan-Korea Annexation Treaty,' ending the Joseon Dynasty. Japan invaded China for the purpose of annexing the Korean Peninsula