Su Yan, a female assassin betrayed by her own, has her soul transported into the body of Wei Ciyuan, the legitimate daughter of the Wei family, who has endured over a decade of poisoning and been left disfigured and mentally impaired. By day, she plays the fool, coldly watching as the scoundrel men and wicked women plot against her. By night, she dons a crow mask and takes the alias Cold Crow, acquiring a brothel and establishing an intelligence network called the Eclipse Moon Pavilion. Wherever the crow cries, lives are reduced to dust. Yet Xiao Jinyan, the ruthless regent, unexpectedly falls for Cold Crow. With an imperial decree of marriage, the seemingly foolish young lady is wed into the Prince Regent's residence. The inner household becomes a chessboard, while the imperial court becomes a battlefield. When the mask finally falls, the person beside her pillow turns out to be the very one she loves. Meanwhile, a frail figure lurking behind the scenes has long since laid an inescapable web.