Shen Qingrong is the most mild-mannered beauty in the imperial palace. She spends her days embroidering and copying sutras, so quiet that people can almost forget she exists. The women of the six palaces mock her as all looks and no substance, saying she only knows how to curry favor with the emperor and empress dowager through lowly tricks.
No one knows that every night, when only the wind and the palace water clock can be heard within the walls, this "mild-mannered" beauty changes into sleek black clothes and slips through the palace’s most secret corners like a silent shadow. She is searching for the truth behind a bloody massacre from ten years ago, a truth buried so deep that it could shake the entire dynasty.
And no one knows that what she carefully conceals is not only her purpose in roaming the palace at night, but also martial arts prowess astonishing enough to shock the world.