There were strange masks which change your looks and goes off when you say mask off.It was sold by a mysterious man but it worked and no one ever got hurt so the government allowed it but they destroyed all of them later when people overused them with a device which destructed them but two special ones remained which were the ones of marinette and luka but theirs had a rule where if anyone apart from family found out about it,it would self-destruct itself and self distract means ahut off for good/permanently.Though the mask was somehow okay with the government knowing meaning that they weren't criminals after getting permission from the government though the other didn't know that the other had a mask until some time.Both Luka and marinette wear the masks.Also P.S Marinette will dye her hair red later and look exactly like rias and will have real style not that she doesn't have it in the serie but better and her and luka are famous and so are idols.