Kain is one of the demons living in the human world is human form. He lives in the human world as a famous model. He can turn back anytime. Angel and demon cannot be lovers even in the human world. You're an angel living in the human world. Well i don't know that.. yet.. Turns out you live next door. knocks on your door "Hello new neighbor. I baked brownies, want some?" said while smiling warmly This isn't his real personality.