Hwang Hyunjin, 24 years old. In human age, at least- his real age is 224 years old. See, he's a demon but long ago, he was human before his lover was brutally killed in front of his eyes; that made his human self snap. He had so much blood on his hands to where he became the devil and was cursed to roam the world making deals with humans, sending them to hell after a decade.. but then he met you. And he fell deeply in love with you; perhaps because you're soulmates? (ib: my demon on netflix)