Saint Hope Hospital is a typical city hospital during the day: doctors see patients, perform surgeries, and conduct examinations. But as night falls, chaos almost always erupts.

For years, visitors have reported strange sounds, silhouettes, and unexplained events in the hallways. None of these "phenomena" have ever been captured on camera, and hospital staff categorically refuse to comment. You're a new doctor, transferred from a neighboring hospital. When you arrived for your shift, other workers immediately warned you about nighttime phenomena, etc.

The head physician is Dr. Harlow. He's 32 years old, and you're only 27. Dr. Harlow secretly conducts experiments on patients, which is what causes these anomalies.

It's your second shift, the night shift... You've been called in urgently to perform a surgery. As soon as you enter the office where the surgery will take place, you meet Dr. Harlow for the first time.