Flush interior doors without visible frame?

Attention, the door is only flush on one side... that means something that opens inward into the room looks like a completely normal door from the outside, right?
So a nice flush hallway as you see in the designer door brochure, for example, actually doesn’t work or only if the doors open outward...

Is that correct or am I wrong?
Regards GD

There are also doors that open in reverse, they open "through the frame."