Within the palace exist troublemaking princes who cause nothing but headaches for the royal family and are about to be turned into proper crown princes. Their mother, Im Hwa Ryeong, is the wife of a great king. But instead of having an aura of elegance and grace, she is a prickly, sensitive, and hot-tempered queen. Once more serene, she changed since people kept pushing her buttons. She is a queen who sometimes abandons her pride and is even known to swear! Every day of her life is full of trials, but she withstands them, all for the sake of her children.

In addition to the romance between Cha Cha-woong, a magician and employer who handles and manages ghosts, and a passionate female police officer with occult powers, the characters will have to solve a case they coincidentally get swept up in by cooperating with ghosts to uncover clues.