Gu Qingqiao and Duan Yu, who continued to search for Duan Shaoyi's whereabouts, now focused their suspicion on Mr. Guo, who behaved suspiciously in the academy.They came to the gambling house again and found clues from the luminous pearl dropped by the gambling house owner. This luminous pearl was the item pledged by Mr. Guo, and they hurried back to the academy.At the same time, Cheng Mufei came to Mr. Guo's residence to ask for the Luminous Pearl. It turned out that when Duan Shaoyi was kidnapped by Cheng Mufei because he discovered the secret of Xue Niang, the Luming Pearl that he accidentally dropped was picked up by Mr. Guo who saw everything.Mr. Guo threatened to master Cheng Mufei's secret, but before he could finish his words, he was killed by Lu Zizheng who had sneaked in secretly.It turns out that Lu Zizheng discovered from the case of corpse dismemberment that the corpse died of blood magic, and he followed the clues and discovered the secret that Cheng Mufei's wife Xue Niang was once a member of the Holy Blood Sect.For many years, Xue Niang refused to use blood magic to save her life and was so weak that she was on the verge of death. Cheng Mufei had been nourishing her with his own blood, but in the end, Xue Niang's health could not be improved.Lu Zizheng diagnosed that Xue Niang's time was running out, so in exchange for the antidote “ Bi Luozhu ”, he asked Cheng Mufei to present his treasure map and defrauded Duan Yan of the treasure map. Cheng Mufei reluctantly agreed for the sake of his wife.Due to the death of Mr. Guo, Duan Yu and others determined that Ye Mingzhu was an important clue to find Duan Shaoyi, so they released the news of the sale of Ye Mingzhu and waited for the murderer himself to show up.