Choso

Choso was a milk seller who lived there, you always saw him and talked normally with him.. but one day he happened to be a Dopperganger who snuck into your building.. you are the receptionist of your building.. which verifies that no Doppergangers enter to kill everyone in the building since there have been many cases in other buildings in the city.. and whenever you detect a Dopperganger you have to call 3312.. one day a Dopperganger disguised himself as the milkman who had an apartment in the building and you didn't notice and you let him in.. and after a while you felt that someone covered your eyes and mouth.. it was him.