Xie Catcher came to report that Dugu Xia wanted to escape from the city after being drunk, but now he has been tied back. Su Wuming and Lu Lingfeng took him back to Dugu's house. When Dugu Xia's neighbor old man saw the official mission coming, he told himself that he had heard Dugu Xia's sharpening knife in the middle of the night at that hour, and that Qinghong must have been killed.
Su Wuming and Lu Lingfeng went to question Dugu Xia Shu whereabouts. Dugu Xia Shu said that night he suspected that his wife had an affair and was about to strangle her to death in the middle of the night, but remembered that he had also owed some debts to his wife over the years, so he wanted to go to the kitchen to make wontons for his wife to eat, so he must have sharpened his knife and cooked. But later, after making wontons, I found that Qinghong was gone, so I suspected that my wife had returned to her parents' home in anger. Seeing that Dugu Xia Shu was in a daze, Lu Lingfeng did not believe what he said.
Su Wuming and Lu Lingfeng investigated the Dugu family again. Thinking of the man in black who went straight to the rice jar that night, Su Wuming asked Dugu Xia to move the jar to dig the ground by himself. Dugu Xia found the seven silver ingots from here. The silver ingot was kept by Qinghong and could only be used when he passed the exam.
The catcher then came to report that Qinghong's corpse was found in the Tudi Temple. It turned out that the beggar Donglang had used the medicinal materials given by Su Wuming and his injuries improved. So he came to the Tudi Temple to thank Tudi Gong, and accidentally found Qinghong's corpse in the Tudi statue. Su Wuming ordered a man to bring Dugu Xia Shu to recognize the corpse. Dugu Xia Shu, who was in a daze, felt sad and painful when he saw Qinghong's corpse, and the memories of killing Qinghong flashed in his mind. Under great stimulation, Dugu Xia Shu also claimed that Liu Youqiu must have killed him.
Uncle Dugu Xia, who was locked in the county government, dreamed that he had prepared wontons for his wife. The two reunited. Uncle Dugu Xia promised Qinghong to move home from the Confucian Temple. Qinghong also persuaded him to go to Chang'an to prepare for the exam, and he also wanted to accompany him to fulfill Dugu's mother's last wish to have a child as soon as possible. The sober Dugu Xia Uncle thought that he had not killed his wife, but in a blink of an eye, he thought that he had killed Qinghong and Liu Youqiu, and his spirit was extremely collapsed.
Su Wuming told Lu Lingfeng that he speculated that Dugu Xia was not the murderer. Dugu Xia's expression was in a daze and the testimony was inconsistent. Dugu Xia's uncle moved the tank to dig the soil and panted today and could not move Qinghong's body to the land temple in the back mountain. But Lu Lingfeng did not agree with Su Wuming's inference, believing that Dugu Xia's trance may be caused by murder, and he could ask for help in transporting the corpse. Su Wuming admitted that he found out after an autopsy that Qinghong died of poison injury, not by a knife. When the man in black talks about Dugu Mansion every night, he knows the location of the silver ingot and must be familiar with Qinghong. Su Wuming also told him that he had recorded his investigation skills in the books given to Lu Lingfeng in Chang'an, and hoped that Lu Lingfeng would have the opportunity to read them well. Su Wuming believes that the investigation of the case can only start with Uncle Dugu Xia, but it seems that Uncle Dugu Xia himself has confused reality and dreams.
Lu Lingfeng saw Uncle Dugu Xia in prison and was unwilling to sleep in prison because Uncle Dugu Xia had nightmares as soon as he fell asleep. Lu Lingfeng imprisoned Master Fei Ji in Dugu Xia's prison on the grounds of quitting alcohol. When he learned that Dugu Xia's uncle had nightmares and did not dare to fall asleep, Master Fei Ji observed Dugu Xia's symptoms at night and treated him with acupuncture the next day. Master Fei Ji persuaded Uncle Dugu Xia to receive treatment, and then told Su Wuming and Lu Lingfeng that Dugu Xia’s nightmare disease is not apnea, it may be because he was frightened, maybe he had belching since childhood, and maybe he was used by the gangster to have a fragrance. Sure enough, Dugu Xia Uncle slept soundly for twelve hours after receiving treatment, and did not have nightmares. After waking up, he denied that he had killed Qinghong and Liu Youqiu.
