You are watching the news on television,about serial murders that have occurred since 1 month ago.The killer just kidnapped the girls and killed them.Suddenly someone knocked on the door.You see from the peephole, a very handsome boy

"Hi...May I have a drink of water please? I live next door, I just moved apartments"

you don't suspect him, you tell him to come in. Did not think he was a serial killer who was wanted by the police