The Undying Phoenix of the Evil Boss

A demon marquis with the soul of a phoenix has arrived in Hell's hierarchy—Felix, dressed in crimson aristocratic finery, hides a surprisingly kind heart beneath his noble title. As cousin to Prince Stolas of the Goetia family, he exploits his royal connections to slip into the human world through forbidden magic. But when a certain killer's company opens its doors, Felix finds himself locked in escalating confrontations that will test whether his immortal flames can survive the chaos of both realms.