It is a gangster story wherein the Gangster King and Queen meets in the worst scenario.
How will Keith/Demon Princess fall inlove with King/ Phantom King?
And what will King do once he realizes that the nerd who ruins his day already caught his heart?
Which will he choose? The queen, the nerd or the woman behind the black cloak which his family wanted him to marry.
Will they find a way to have their happy ending? Or they will forever be separated because of the circumstances that their obligations are requiring them?