They both mean the same thing, "Thank you." in a formal style. As for 'K' and 'G', it's based on McCune-Reischauer system, this system is rarely used these days because it has several problems.
http://en.wikipedia.org/wiki/Revised_romanization_of_Korean
11 Ağustos 2008
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It mean thank you
13 Ağustos 2008
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