The female protagonist: a clever reasoning expert (after meeting Li Wangshu, she was asked to pretend to be a palace guard) The male protagonist: a tsundere, affectionate and cool prince 1V1, reasoning and romance. The heroine and the hero met by chance, and then experienced various cases together: strange serial murder cases, secret cases in the harem, unsolved cases in the world... A suspenseful romance novel 2333333333