Parallel BTS (btsxbts) {Completed}

BTS had moved to a new and bigger dorm. All of them had individual rooms but one room made them curious. The eight room with a rainbow colored door. Ever since they move, they wonder what was in that mysterious room. All room had a key except for that.
They soon leave it alone until one day, they saw the door was open ajar and when their curiosity get to them they went inside only to find them self in another world and met their parallel self.
What will happen?