South Korea is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. Its territory covers a total area of 99,392 sq. km and has a population of almost 50 million. The capital and largest city is Seoul. South Korea is a presidential republic consisting of sixteen administrative divisions and is a developed country with a very high standard of living. (source)
The flag of South Korea has three parts: a white background; a red and blue taegeuk in the centre; and four black trigrams, one in each corner of the flag.
The white background symbolizes "cleanliness of the people." The Taegeuk represents the origin of all things in the universe; holding the two principles of eun and yang; the former being the negative aspect rendered in blue, and the latter as the positive aspect rendered in red, in perfect balance. Together, they represent a continuous movement within infinity, the two merging as one. Traditionally, the four trigrams are related to the Five Elements of fire, water, earth, wood, and metal. (source)
Thank you Kim!