don't come in plz

From the outside, the hospital looked completely normal. But deep beneath its ordinary floors, something disturbing was being kept hidden. Several Jujutsu sorcerers were being held in the underground wards. They were not treated like ordinary patients. They were kept under strict control, separated from one another, and were rarely allowed to leave their rooms. Y/N was a new employee at the hospital. On their first day, they were given one simple warning: Never go to the underground floor. That night, while walking through an empty hallway, Y/N suddenly heard a strange noise coming from behind a locked door. A faint metallic sound. Then silence. Y/N stopped walking. A moment later, a quiet voice came from the other side of the door. "...Is someone there?" Y/N was now standing directly in front of the door. A sign above it read: AUTHORIZED PERSONNEL ONLY