This is the 850th most frequent Korean word.
bts
"BTS" is not a Korean word but an abbreviation for "Bangtan Sonyeondan" (방탄소년단), meaning "Bulletproof Boy Scouts," a South Korean boy band.
Here, 'bts' or '방탄소년단' is used as the name of the popular music group, indicating their identity.
방탄소년단은 세계적으로 유명한 그룹입니다.
BTS is a globally famous group.
In this sentence, 'bts' refers to the group in the context of their concert.
저는 지난주에 방탄소년단 콘서트에 다녀왔어요.
I went to a BTS concert last week.
The term 'bts' in this sentence is used to describe the songs belonging to the group.