It's short for "그렇군" and more like slang meaning "Oh I see" or "(Yeah) that's right".
그렇군 ☞ 글쿤
그렇군요 ☞ 글쿤요
그렇구나 ☞글쿠나
\^o^/
2012년 2월 16일
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글쿤 is the shorten form of "그렇군요"
this expression is often used in the following situation when you want to utter your agreement to someone's comments. "Oh so it is"