"Be Aware that failing to pay back within the end of the month would result to severe consequences." The same notice had always been hanging there in front of the Bank, and nobody had ever thought much of it, thinking that it was just a harmless warning. But that was before the killings started. Each victim was found with an arrow pierced through their chest, in the exact same spot with the exact same arrow. Through careful investigation, the police have concluded that the reason for the killing was none other than failing to pay back the money. But the question was : who was in charge of it? Demon's Cupid is a story on how cupid's aren't as innocent as they seem to be. Through countless lost of lives and fear hanging over the district, Jeon Jungkook is determined to to solve this twisted murder, even if it'll cost his life.