Somewhere in this world, there is a room.

No one knows its exact location, just that it exists.  No one knows how to get out, just how to get in.  No one can look in from the outside, just look outside from the inside.

There is not much known about this room for those who have been in it dare not talk about it that much.  But there is one thing that they say about the room: once you get out, you’ll spend the rest of your life trying to find it to get back in.