She is the most inconspicuous female official in the East Palace and the sharpest knife in the prince's hand. During the day, he bent his head to study ink, and at night, he held a sword to kill people. Until she discovered that the clues she had been searching for for ten years to exterminate the family and the dynasty secrets that the prince was sworn to guard pointed to the same taboo name - the current emperor. If he wanted revenge, he would have to subvert his empire; if he had feelings, he would have to face the wronged souls of the nine clans...