Makgeoli, or Mukgulli, or whatever you want to call it is a rice beer. Its really not like sake at all, more like some wierd, slightly sour, fermented rice water. I found a korean website for making Makgeoli, and here is the google translate for it. Give me a few days, and I will give you a better translation that you can understand.
The website would be good enough. I'll make my friend translate.