[LinnyLo]

Korean and Japanese are a bit similiar. The Korean writing system is completely different. Old Korean characters were based on Chinese characters, but modern Korean was invented by the King, Sejong the Great, in the 1400's. The grammatical structure between the languages is pretty much exactly the same, since they are both based on Chinese sentence structure. I think both Japanese and Korean are more similiar to Chinese (specifically Mandarin) than they are to each other. If you were to learn another language, I would assume that Mandarin would be the (generally) more useful of the two. Then again, these are just my thoughts and it all depends on who you are.