The national flag of Korea is called the Taegukgi.
Korean hoist the flag on national holiday like independece day(독립기념일).
I used to do a homework drawing the flag, when I was a child.
It's easy to make a mistake for drawing it like upside down and numbers mistakes.
We call the middle shape of our flag to "Taegeuk" 태극.
That's why our soccer players were called "태극전사".
오늘은 한국의 국기에 관해 조금 살펴 보았습니다.
For more information 태극기
http://en.wikipedia.org/wiki/Flag_of_South_Korea