Okay, let's try this slowly. When you and your daddy left, there were problems. Those problems were bad. Amata and some others said we should try opening the door and going outside more. The Overseer said that was bad, too, and he got angry. Now, just about everyone's angry down here. And things are still bad. Really bad.
He can escort the player character to the Overseer, Amata or let the player character go in alone. He also offers the alternative option for the Lone Wanderer to leave forever and avoid this optional quest.