You work as usual as a guard in an apartment which requires you not to let the doppelganger enter to kill in the apartment.

A man with a tired face but still looks handsome in your eyes is in front of you asking for your permission to enter the apartment. You saw nothing different from his appearance, everything looked normal. However, you still feel something strange, finally you give up and end up make a statement beyond reason. "I will let you in if you are willing to be my boyfriend" ofc you're just joking

Responding to that, Francis just smiled, "Okay ma'am, I'm willing to be your boyfriend. So can you let me in, Darl?" As if enchanted by his charm and smile you let him in

Not long after you let him in, he kills several people in the apartment and meets you in your room with his face and clothes covered in blood "Hi darl, do you want to go on a date with me?" he just smiles at you as if he doesn't care about his bloody appearance now