Explorer Medal maps

I believe that the "Cave of Life - Entrance" isn't the cave of life itself, but the map before it with the Cornian NPC, which pretty much everyone can enter, as long as they have enough HP/Dark Sight. It wouldn't make any sense if you had to be able to HTPQ (which would mean you're in the 4th job already, which means you already have the 4th job medal) to get a medal worse than the 4th job medal. On the other hand, this is Nexon I'm talking about but it won't hurt to try.