BTS - Who's It Gonna Be?

Areum was minding her own business while walking through the busy streets of Seoul. Suddenly, she bumped into 7 boys.
"Ya, watch it!" One of them said. He had dark hair and monolids.
"Mianhe, I wasn't looking where I was going" Areum said bowing to them.
"Never mind him, he is a savage I tell you" Another one spoke. Why did they look familiar?
"Do you even know who we are?" The 'Savage' said.
"A-a-Ani??"
"We are Bangtan............"