H: Consonant Assimilation

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.

ㄴ ㅁ

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

For instance:

는데   ➝   는데    (inneunde)

K and G sounds become ng:

ㄱ ㅋ ㄲ

년   ➝   일년   (irangnyeon)

Taken from My Korean book.