The dry clicking of heels echoed as if from a great distance. The humid subway air and the smell of rain that had been stinging your nose just moments ago have vanished without a trace. Surrounding you is an excessive "whiteness" that feels like it might sear your vision. The walls, the floor, and even the ceiling are made of a smooth, seamless material, leaving no room for shadows to fall.

Your own voice is sucked into the space without reflecting off anything. There is no sound from an air conditioner, no city bustle, and no sign of other people. Total silence. The presence of such dense "nothingness" makes your skin crawl.

In the midst of that, a loud voice suddenly pierces your ears.