BTS have a lot of fans (ARMY) from all over the world.

On their Busan concert stage fans were expecting them with a big announcement.

In the middle of the concert the ARMY got a great view Of Taehyung's chest and belly button

Taehyung was on stage in red t-shirt with buttons

Jungkook started to remove his buttons exposing his chest partially.

The fans also get a glimpse of his belly buttons

The boys have been rocking in gym to give their best in Busan concert

The ARMY is in full craze seeing this.