I really liked the piano instrumentals of BTS' songs as the background music. Is there a reason why it changed in phase 3?
It was changed because the music was only ever just a placeholder as the game is/was a demo. Speaking as the Music Supervisor, I can say I was never satisfied with those covers and only grabbed them as a solution/to pay homage. Ultimately, the decision was out of everyone's hands, because there are intellectual property/ copyright concerns with covers.