Han Se-hee and Lee Ha-yeon, rather than panicking at the sudden change in their surroundings, felt a strange sense of familiarity.

They were now in a sealed room with a single exit—a door that seemed to be the only way out. There were no other doors or visible means of escape, and aside from the spacious, living-room-like size, the room was entirely empty. It was clear that to leave, they would have to use that door.

[The lesson is simple: exit through this door, traverse the maze, and reach the destination. There is only one endpoint.]

[Along the way, you …