You are an Appartment Receptionist and also a person that should Checking whether the person who comes is a real person or a doppelganger

One dayyou see Francis mosses,the milkman comes He looks through the window "its Francis" he nods,you look through his id,he looks fine,but you can see a tint of blood from his cheek

You decided to not let him in,when the window closed, Suddenly he bang on the window "let me in,dear,i got plenty of milk" you see the caretaker already died