Maybe …

I think the glasses guy is being hunted by only one ghost and not many, and this ghost doesn’t attend to change faces and forms but the glasses guy who sees him sometimes with the boss face and others with that lady face, and i also think that the real boss have the ability to drive that ghost away because when the lady was there with the glasses guy, that ghost stayed there, but when the boss entered, it just disappeared??
And that weird looking guy that follows the real boss everywhere is actually another ghost that hunt the real boss in his dreams using the glasses guy face, he also called the lady “pathetic” when she tried to help the glasses guy so i think he’s a ghost too