also, make sure that the folder names on data/sprite are written correctly (If you're using Windows 7, then the folder names shall be written on Korean characters (well, shall be too even you're using Windows XP).
The folder name (written in Korean) can be copied and pasted on Google Translate, from Korean to English, and you'll be able to know what that folder contains.
If they are not in Korean (in ASCII), then you can use Unbollox (From RateMyServer) to change them into Korean.
Have a nice day!