좋은 생각 / Good Thoughts
It's the name of a booklet published every month that is very helpful to anyone interested in learning Korean through the stories written by common people about their everyday experiences. The stories are generally very short, around one page each. One or two stories every day. Depending on who the author is, the text can be easy or difficult to comprehend, but in any event it is a useful reading since it is reflecting the living language rather than carefully crafted (and therefore artificial) academic textbooks. Can be bought in any 슈퍼 or a newsstand in the subway, also very cheap.