It's one of the first things you learn when living in Korea, and that is you must separate your trash down to every little piece. Food scraps can't be thrown in with your regular garbage and sometimes require a special bag. Often, though, buildings collect the food scraps in one large bin, which is then sent off to someplace to incinerate.
The real problem, I feel, comes down to how you personally collect your food scraps without stinking up the house. For my first few years in Korea I put my food scraps in a separate and bagged waste basket and threw it out every few days. This worked, but during the warmer seasons things would get stinky and buggy.
Finally, this year I came upon a miracle plastic device that seems to help do the trick.