Shen Qingyan, the legitimate daughter of a military general's household, is infatuated with Prince Yong, Xiao Chengjing, stealing the tiger eagle tally and sending secret letters for him. Accidentally hearing the inner voice of her maid Qingdai, she learns that Xiao Chengjing only intends to use the Shen family and ruin her entire clan. After awakening, she switches the tally, rewrites the secret letters, intercepts the silver notes, protects her family, and allies with the sixth prince, Xiao Yunzhan, to counter Prince Yong and crack the conspiracy of treason and witchcraft.