In modern society, corporate security measures have become commonplace. Access to office buildings requires a key card, and forgetting it means being locked out. Especially during late nights or holidays, when no one else is around, losing your card can leave you completely isolated and unable to return. For a woman caught in such a situation, fear and anxiety multiply. While companies deploy security guards for safety, these guards aren't always protectors. This film depicts a sinister guard who, during late-night or holiday patrols, approaches a woman alone in the building with malicious intent. His cruel psychology and heinous actions amplify the tension and terror. This work portrays a realistic scenario, delivering a powerful, disturbing impact to viewers.