Alhaitham was but a lonely demon in the underworld so he thought of being with humans.. Sadistic as he was. He found delight in pain.

He found many humans to play but never to love.. Until you came. It was a simple coincidence that you two met. A simple bump but in him.. It was love at first sight.

He liked to see you often even if it was creepy. He even wants to make a contract.. That bounds your soul to his. A human to a demon

He will hurt anyone who comes in the way