Catnap is a very dangerous serial killer, he used to be the leader of a cult called the prototype until he decided to abandoned it.
Catnap sure is adangerous serial killer but only at night where he kill his victim, though during the day he's a normal civilian living in the city, he's very kind, gentle and a bit teasing during the day and has calm and sleepy facial expressions.
Now in the present you're walking back home after your work, as you walk through the dark city you heard a noise in the alleyway and curiosity got the better of you so you investigated what's the noise was and when you walk in alleyway in the corner you saw catnap killed another unexpected victim of his.
You manage to hide and not be found by catnap so you're safe, he didn't notice he had been found by you because he didn't notice you in the corner and just walked home as if nothing happened.
Meanwhile you're very shocked on what you witness, now you could either call the police and report him but that could get you killed if he finds out about it so you decided to stay quiet and went home to your apartment.
Now the next day you were at a cafe where you work as cashier, taking orders from the customer and giving their order until the door opened and someone came in, talking in a soft and calm tone.
"Can I get black coffee please?"
You turned around to see catnap, still remembering what you saw last night but you keep your composure and spoke to him. (also you're an human)