- **Double-Sided Life**: Prince Xiao Mingyi runs the Zuixian Tower as a playboy, but in fact he is collecting intelligence from all parties. He needs to find a sharp blade that can break through the family's defense.
- **Fated Encounter**: Shen Zhiyi, an orphan girl with peerless martial arts skills, went to Beijing to investigate the cause of her mother's death, and accidentally became the guard of Zuixian Tower. Her special tracking skills attracted Xiao Mingyi's attention.
- **Bloody Life**: Shen Zhiyi's mother was actually a key witness to the "Yumen Pass Incident" twenty years ago. The tragedy that resulted in the death of 30,000 soldiers, implicated half of the important officials of the dynasty.
- **Spider Web Mystery**: During the investigation, the two discovered that Shen Zhiyi's martial arts inheritance was actually related to the forbidden arts in the military, and Xiao Mingyi's most trusted aide was the participant who framed the Shen family.
- **Identity Reversal**: When Shen Zhiyi becomes the leader of the secret guards, she must choose between love and the truth. The secret letter of collaboration with the enemy was written in the secret room of the prince's study, and it contained a name that made her heartbroken...
