I occasionally rapped along to some homegrown Korean rap. And then a friend introduced me to Wu-Tang and played me 'Enter the 36th Chambers.' It was very shocking. And then I started to look for different albums. This was pre-Internet, so it's hard to find the music, and it was even harder to find music videos.
I would write down the lyrics to 'C.R.E.A.M.' in Korean - not translating it, but phonetically writing out each word. I didn't know what they were saying, so I would just write everything down as I heard it. I would recite it and imitate it like that. That's how I started to write my own raps.