BTS is actually from all over Korea so its really cool to check out what accents they use!
Here's a guide to speaking in their Satoori (dialect)
And a map for reference :)
Ilsan: Rap Mon
This is the really standard accent since it includes the Seoul area. Any Korean you learn and usually hear on TV would be this accent!
Daegu: V & Suga
Busan: Jimin & Jungkook
Standard Accent - 그래 (geu-rae) means "oh, really?"
Gyeongsang-do Accent - 맞나 (man-na?) means "oh really?"
Standard Accent: 밥 먹었어? (bap meok-oess-eo?) Have you eaten?
Jeolla-do Accent: 밥 믁어잉? (bap meuk-eo-ing?) Have you eaten?
Another Jeolla-specific word is 시방 (shi-bahng) which means ‘now’ (instead of usual accent like 지금)