Seven-year-old Knife Master Lu Baoer faked his death to escape from the Lu family in order to find out the truth about the mysterious death of his eldest sister Lu Xin'er, and used a kitchen knife to travel between yin and yang. She broke into the Qi Mansion with a knife and solved the mystery of the old lady's resentment trapped in the chastity arch. During in-depth investigation, she implicated the widower Feng Guiniang, and discovered that her resentment was closely related to the shocking old case of the theft of military pay and the abduction of a good daughter. With the help of Qi Mu, Zhou Yu and Daoling Lindao, she discovered that her sister's death was actually related to Xia Houxu, the son of Zhongshu Ling. When the investigation pointed to the Langcheng massacre twenty years ago, all the evidence pointed directly to Dang Haji! Lu Baoer peeled off his cocoon in the light of swords and blood, vowing to uncover the shocking conspiracy shrouding the imperial city.
