MelOn, Bugs, Monkey3, Naver, Daum, Olleh, and Soribada are major Korean music-selling sites.  Sort of equivalent to itunes.

They all have charts.  I'll be updating as much as possible on the top three best selling songs  that were sold in korea.  

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MelOn, Bugs, Monkey3, Naver, Daum, and Olleh all sell music (like iTunes).

Soribada just sells kpop songs. 

Looking at the top 3 songs, you can tell which songs are popular in korean, and compare it to the songs that you like or laugh at other kpop fans saying that "they think they are like korean people by liking kpop".