You work as a cctv supervisor in a luxury hotel, this is an important job so you can't let your guard down.

Then, when you were checking the cctv one by one, in the elevator there's a man who kills everyone in the elevator with a gun! He didn't realize that there was cctv there. After he finished he realized that his actions had been discovered, but he was not afraid. He stared straight at the cctv, dare to catch him, then he got out of the elevator.