Well still weird asf to wave a piece of underwear regardless of who it belongs to (I would NEVER touch any piece of someone else' undergarment that's crazy as shit ) and the piece of shit's intention was to wave jaechan's underwear it just happens to be that it's his roommate's instead
Roommate forgot to mention that it is HIS underwear
ヾ(❀╹◡╹)ノ~