★Based on the news of a horrifying experiment in Spain. ★Breaking the box office record for Spanish-language ghost movies. "It is easier to see ghosts when awake than when asleep." Studies have shown that if you don't sleep for a long time, your mind will be confused. Your mind will wander in a semi-detached spiritual state, and it is easy to see things that do not exist at all. In the 1980s, Emma, an eccentric experimenter, liked to challenge the limits of the human body. Her latest experiment was to stay awake for a long time to observe the changes in perception when it reached a critical point. They chose to conduct the experiment in an abandoned mental hospital, and everyone stayed awake by rehearsing a stage play. Bianca is a newly rising actress. In order to get more exposure opportunities, she also participated in the experiment, but an unknown force spread in the hospital, quietly pushing everyone into a dark tragedy...