(Demon).
A word that often refers to devils, Satan, and all things wicked. Except here, it's just a job popular for it's stability and high income.

Woohyeok, a struggling convenience store part-timer, makes a bid for the annual incubus open recruitment and ends up receiving a baffling offer from his friend Siwoon, whom he's been thankful to constantly rely on for a long time…

"You want to pass the incubus exam that bad? Then practice with me."

Lessons in sex begin as a means to prepare for the incubus exam…

It does feel good, but is it okay to be doing this... between friends...?!