Demon. 
Though it signifies the devil, Satan, and all evil in the world, here it's just a stable, high-paying, popular job. Woo-Hyuk, a convenience store part-timer struggling daily to pass the Incubus exam, held only once a year, one day receives a startling proposal from Si-Woon, his long-time, ever-helpful friend... 
“You want to pass the incubus exam that badly? Then practice with me.” 
A sex class begins for incubus exam prep... It feels good, but between friends... Is this okay...?! (Source: MrBlue, translated)

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