The Mujer de los sueños (Dream Woman) recurs across the narrative as a masked, mysterious entity. She manipulates events by approaching individuals and asking if they can "see their backs," a question that triggers hidden desires or fears, drawing characters into scenarios where subconscious urges manifest. Her interventions lead to confrontations with deepest fantasies or anxieties, blurring reality and illusion.

For instance, she appears outside a massage parlor to a college student conflicted over her boyfriend's infidelity, heightening the student's curiosity and arousal upon discovering the masseuse resembles her. In another case, she influences a voyeur whose obsession with a nurse materializes into a supernatural entity merging with him during hospitalization.

Operating without explicit motives or personal history, she orchestrates scenarios where characters explore taboo or repressed psychological aspects like voyeurism, power dynamics, or forbidden relationships. She enables one man to control women through magical cards that pull them into a card-based fantasy world, and intensifies a stepmother's seduction of her stepson, amplifying their psychological entanglement.