When speaking 한글 (Korean) what are the hardest things to pronounce and why?

I'm living in Korea and I'm great at Korean and the hardest word for me is '가는 말이 고와야 오는 말이 좋다'.

You have to say "Ga-nen-mal-i-joha-ya-onen-mal-i-jota".

explanation: the line "to save the day, harry must get past a scary three-headed guard dog" from the summary best justifies the conclusion that harry potter and the sorcerer’s stone was influenced by ancient greek mythological literature. the three other choices had nothing to do with ancient greek literature - and the words "three-headed guard dog" are what makes that choice the correct answer.

it can be both; depending on the situation at hand.

explanation:

let's just say i get in to a confrontation with someone, and they say "ur mom", it could be seen as an insult. or depending on the relationship or comfortability with the person it may be seen as a joke. the distinct line is how the chemistry behind the confrontation.