The third prince, Li Ling, who ordered the sorcerer Hongju to marry into his family, is Ryo, with whom he once had a history! Ryo has become a secret magician to protect the imperial palace, and only the queen can save him. In other words, "marriage is a distress signal", and a situation is happening that requires Red Pearl's help... The two of them enter into a provisional marriage and begin their investigation. The back palace is full of miasma (a miasma that causes noxious gas), and the plot is a whirlpool of intrigue...? The strongest couple (temporarily) run around in this Chinese demon-fighting fantasy!