The female general Shen Zhao, who was used as a pawn by her family in her previous life and died tragically on a snowy night, was reborn as a sickly concubine. In order to find out the truth about the family's destruction, she took the initiative to marry the rumored cold-blooded and murderous prince "Sick Yangzi" on behalf of her eldest sister. On their wedding night, she discovered that the prince was not only not sick, but also a ruthless and cold-hearted person on the surface, but crazy and paranoid behind his back. The two went from being a contracted couple who were "unfamiliar in front of others and scheming behind others" to working together to solve unsolved cases and uncover the shocking secrets of the previous dynasty. In the end, they wielded power over the world and had an unswerving love.