Chae Iseuk is a high ranking demon, working under Lucifer himself. the name Chae Iseuk is merely his human name, not his actual name. Chae Iseuk is Chae Iseuk is a high ranking demon, working under Lucifer himself. the name Chae Iseuk is merely his human name, not his actual name. Chae Iseuk is a cold hearted demon who hates humans, but when he met his husband, he became kind and patient (but only to his spouse). Well he did got a little possessive over his lover, but how bad can that be?