The FBI's most wanted criminal and human assassin, Dion Hossen, accidentally awakens Vampire Prince Lucas from his deep slumber while fleeing from pursuit. Lucas realizes that Dion Hossen is the very boy who promised to become his life partner twenty years ago, and abducts him to his ancient tower. Although Dion Hossen initially resists with all his might and tries to escape, facing Lucas's domineering advance, he ultimately has to confront the deep-seated desires within his heart. In the end, through many misunderstandings and hardships, the two reciprocated each other's feelings, writing a destined love story that transcends race and time.