I also live in Korea, but the only places I could imagine being able to survive for $600/mo would be outside major cities and eating kimbap and ramyeon for your takeout meals and living in a goshitel... no offense! Of course, if you're putting down a large deposit, then your rent could even be free.

Personally, I wouldn't bother with jeonsae unless somebody else is paying for it (parents, employer, bank), keep your money in your favorite speculative investment instead.