Sometimes I could not hear the initial "h" sound in the character ㅎ. For example, when I learned a word 회전 (rotation) in Memrise today, it sounds like "we-jheon", and I could not hear any "h" sound.
(It is in the course "2000 Essential Korean Words for Beginners", if you want to know. The link is here but I forgot where the word is...)
However, when I tried hearing the same word in Google Translate, there was clearly the "h" sound.
That said, it happened in other words as well. When the word starts with ㅎ, sometimes I could not hear the "h" sound.
Is this regional variation or only me? Or possibly just a recording issue? It is very difficult to hear them apart at the elementary phase of language learning...