This might not be interesting to some of you, but as someone who studies both Korean and linguistics, I found this topic to be right up my alley.
I saw some discourse earlier on the timeline where a user asked how people who couldn't 'roll' their r's pronounced the word arirang. This of course had some people wondering what the 'r' sound is in the word. In the video I linked, you can hear Jungkook say it at about the
Here's an IPA (International Phonetic Alphabet) transcription for the Korean word 아리랑 Arirang -> [a.ɾi.ɾaŋ]
As you can see, there's no rolled 'r', which in IPA is represented by the upward 'r' symbol. Instead, there's this weird hook looking thing, which is known as an alveolar tap or flap. This sound is closer to the 't' or 'd' sound that you hear in words like butter (/bʌ.ɾɚ/) or ladder (/'læɾɚ/) (in American English).
The ㄹ in Korean can perform two different sounds, the 'l' (as a coda/final consonant) and the 'ɾ' sound (when preceding a vowel). That's why people who teach the language usually say that ㄹ can either be an 'r' or an 'l'.
by Lost-Opinion3554