Another possibility is to read (shudder) manga. Fan translations of these things have practically made a new Rosetta Stone of modern language online. As one of my colleagues has demonstrated, there's a tonne of high quality Korean translations up online of questionable legality or failing that you can nab legit translated hardcopies at a manhwa store, or for cheap, practically-new from Book Off in Shinchon, Seoul (they have this patented machine that shaves books to a high sheen). Then all you have to do is find an English translation online to check back with, and that's dead easy.