Most of this information is taken from 프로성능충 from Ruliweb's GFL forum. Again, if you speak Korean, you're best off reading their sources rather than ours, but the benefit we provide is that we're giving this information in English.
First off, this is primarily made from the Korean sources on Namu Wiki for GFL, which frankly, is a better resource if you can actually read Korean. Their notes are much more complete, and most of this is based on their work. With that out of the way, let's get down to business.