I think It's difficult, mainly for native speakers, that are not used to any sort of ideograms. Korean have an easy writing system (Hangul), when compared to Japanese (Hiragana, Katakana and Kanji) and Mandarin, however the pronunciation is a bit harder. There are a lot of similar sounds like "ga" and "ka", "da" and "ta", "ba" and "pa", but with time and practice, you'll get used to it. I really love learning Korean. The greatest thing is that their entertainment industry are really expanding and there are plenty of amazing movies, dramas and songs. Besides all that, their culture is really stunning and there is always something new to learn, never boring. I highly recommend it, you won't regret it at all. 화이팅 !!! (hwaiting!!! Go for it!!!)

I find it difficult, maybe because I'm just a beginner and I still need more practice. kekeke...

I'm a native Korean, but I still think it's difficult to learn and use Korean. haha.