Obvious that Ladybug is marinette and that Cat Noir is Adrien. Like come on! Their hair style, their mouth, eyes and all that are same! Everybody should know who they really are!
Yeah people are REALLY dense in that show
If everyone knew there wouldnt be a show SO BE HAPPY XD
Actually the Miraculouses have a special kind of magic that makes sure that nobody recognizes the holders, in hero from or in civilian form. This is officially confirmed in the wiki.
What do you think?