Flag Description:
white with a red (top) and blue yin-yang symbol in the center; there is a different black trigram from the ancient I Ching (Book of Changes) in each corner of the white field; the Korean national flag is called Taegukki; white is a traditional Korean color and represents peace and purity; the blue section represents the negative cosmic forces of the yin, while the red symbolizes the opposite positive forces of the yang; each trigram (kwae) denotes one of the four universal elements, which together express the principle of movement and harmony

Credits: CIA - World Factbook