does the korean version of the game really have a korean audio track on it or does it simply use the japanese audio files? (that's what psp games usually do as far as i know)
if so, an undub hack for the english version of the game exists that implements the japanese audio track into the english iso essentially creating exactly what you want.
Son of a bitch, I just checked it again and turns out it is Japanese audio with Korean text only. Dammit, guess that makes my original question meaningless now. And I'm already familiar with the Japanese-English Undub, it's not what I wanted.
Well, while I'm still here, could you recommend any good resources I can use to learn more about this hacking stuff? Articles, books, videos, etc.