There is an unknown layer in the world called "Shadow".
The deceased is imprisoned here by obsession, repeating the last fear and madness of his life.
If a living person is chosen as a "reader", he will be dragged into the shadow and forced to abide by every absurd and deadly rule——
"The figure appearing in the corridor at midnight, don't look back."
"If you smile in the mirror, smash it immediately."
"When you receive a call from which no one is speaking, hang up within three rings."
Violating the rules will lead to death; following the rules will only delay death.
