Flag Ratio: 2:3
The national flag, civil and state ensign of South Korea is 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. In Korean, the flag is called the Taegeukgi (태극기; 太極旗). The flag was designed in 1882 during the reign of King Gojong by Bak Yeong-ho, the Korean ambassador to Japan. Gojong proclaimed the Taegeukgi to be the official flag of Korea on 6 March 1883.
The four trigrams are:
External links
http://www.president.go.kr/warp/en/korea/symbols/flag/