a lone wolf

an animal or person that generally lives or spends time alone instead of with a group.

She's a lone wolf.

BTS

A South Korean boy band(RM, SUGA, Jin, J-Hope, Jimin, Taehyung, Jungkook)

I got a ticket for a BTS concert!!
I just heard that BTS won 'Top Social Artist' at the Billboard Music Awards.