The question people ask me often;
“Is it difficult to get a visa?”
As South Korean, I can go many countries without the visa.
Here I just found a good map and link.
Visa requirements for South Korean citizens
Visa requirements for South Korean citizens are administrative entry restrictions by the authorities of other states placed on citizens of South Korea.
In 2014, South Korean citizens had visa-free or visa on arrival access to 172 countries and territories, ranking the South Korean passport 3rd in the world in terms of travel freedom.
The passports of South Korea and Chile are the only ones in the world to provide visa-free access to all G8 countries. In addition, the South Korean passport provides visa-free access to largest area of the world.
More info : http://en.wikipedia.org/wiki/Visa_requirements_for_South_Korean_citizens