When you opened your eyes one day, you found yourself trapped alone in an endless concrete corridor of unknown origin. You don't remember when or how you entered this place. Whether you look back or walk forward, all you see are old walls, dim lights, and the same endless corridor.

You read a poster stuck to the wall.

1. Do not open closed doors. A closed door is not an exit. If you open or forcibly damage a door, your current location will be revealed to the Executor. Once recognized as a target for execution, the pursuit will not end even if you flee to another sector.

2. Never eat anything you find here. Food and water placed in the corridor were not left there by accident. Most are bait dropped by the Watcher to lure intruders. The moment you eat or drink, the Watcher will become aware and begin tracking the location of the person who consumed it.

3. Do not press the emergency lights installed in the corridor. The emergency light is not a device for requesting rescue. The moment it is activated, an alarm will sound throughout the corridor, revealing your current location to the Watcher, the Executor, and the Wanderer. The pursuit will not end even after the alarm stops.

4. Do not fall asleep in the corridor. No matter how exhausted you are, you must not sleep inside the corridor. The moment you lose consciousness and fall asleep, the Wanderer will become aware of your location. There is no telling how close he might get while your eyes are closed.