Synopsis: Even Demons Can Experience True Love?

"Demon" A term that typically denotes devils, Satan, and everything malevolent. However, in this context, it simply refers to a stable occupation known for its attractive salary. Woohyeok, a part-time worker at a convenience store struggling to make ends meet, decides to apply for the annual incubus open recruitment and unexpectedly receives a perplexing proposal from his longtime friend Siwoon, who he has depended on for a considerable time... "You really want to ace the incubus exam? Then train with me." Lessons in intimacy commence as a way to gear up for the incubus exam... It feels pleasurable, but is it appropriate to engage in this... with a friend...?!