I don’t know about anyone else, but I find it hard to pronounce Korean. Japanese, though not completely absent of difficult pronunciations, is a bit more straightforward, I find. Below then are some guides, courtesy of the book My Korean that offer assistance in the matter.
Some consonants change in pronunciation when combined with these two. For instance:
Some t, s, ch, and h-based sounds become n:
ㄷ ㅌ ㅅ ㅆ ㅊ ㅎ ➝ ㄴ
있는데 ➝ 인는데 (inneunde)
K and G sounds become ng:
ㄱ ㅋ ㄲ ➝ ㅇ
일학년 ➝ 일항년 (irangnyeon)
Taken from My Korean book.