Episode 4 recap: The son of a warlord in the concession mysteriously disappears.
Gu Yuan invited Yan Jun Jie for a meal, but he didn't show up, which made Yan Jun Jie a bit impatient. Gu Yuan and Che Su Wei arrived and handed Yan Jun Jie an appointment letter, appointing him as an undercover detective in the patrol station.After the appointment, Gu Yuan asked Yan Jun Jie to treat them. In order to earn his salary, Yan Jun Jie bought a bottle of good wine for them to drink. As a result, he ended up getting drunk himself. After drinking, Gu Yuan continued studying the Five Elements Chart and finally discovered its secret, leading him to find the second victim.
Based on Yin Zhen Tian's death, Gu Yuan deduced that the second victim was on Du Mei Road. He went there to investigate, but unfortunately, he was a step too late. The second victim was impaled on a bamboo shoot and died from exhaustion. Sun Da Shuai's son, Xiao Zhi, went out with the housekeeper and kept pestering him to buy candied hawthorns. Helpless, the housekeeper bought a string for him.
While the housekeeper was buying candied hawthorns, Xiao Zhi noticed someone carrying a paper figure on their back. Out of curiosity, he followed the person and unexpectedly disappeared. Sun Da Shuai, after losing his child, went to the patrol station to seek Gu Yuan's help in finding his son. Gu Yuan had no choice but to go to Sun Da Shuai's house first to gather information. When Gu Yuan was about to leave after gathering information, the kidnappers called, demanding money from Sun Da Shuai in exchange for his son. Sun Da Shuai, armed with a gun, went to rob the kidnappers.
Sun Da Shuai found the blackmailers who made the phone call, but to his surprise, they were only after money and had no intention of kidnapping Xiao Zhi. This made Sun Da Shuai furious and at a loss for what to do. The news of Sun Da Shuai losing his child spread, causing his phone to be bombarded with calls. He had no way of finding Xiao Zhi.
Sun Da Shuai didn't know what to do and could only seek Gu Yuan's help. He also mentioned the incident of seeking a master's help at his house, believing that the kidnapper must be related to the paper figure.
The master found the paper figure under Xiao Zhi's bed, and Xiao Zhi immediately revealed the incident of being forced by Paper Renqiang to give him the paper figure. Upon learning this, Sun Da Shuai took Xiao Zhi directly to confront Paper Renqiang, but to their surprise, Paper Renqiang had become mentally disabled.
Paper Renqiang couldn't say anything, so Sun Da Shuai gave him a beating. He believed that Paper Renqiang must be the one who kidnapped Xiao Zhi, but Gu Yuan and Che Su Wei didn't think so. Gu Yuan and Che Su Wei went to Paper Renqiang's house to inquire, but they found out that Paper Renqiang had gone to another place for help. Therefore, they asked Paper Renqiang's mother for information.
Gu Yuan learned that on the night of the incident, Paper Renqiang was working at a place near the crime scene, so they went to investigate. The employer confirmed that Paper Renqiang had been working at his house the whole evening and had never left, proving that Paper Renqiang couldn't be the kidnapper. Sun Da Shuai became anxious and regardless of whether Paper Renqiang was involved in Xiao Zhi's abduction, he brought Paper Renqiang back and subjected him to harsh interrogation, even burning the paper figures made by Paper Renqiang.
Gu Yuan and Che Su Wei came to stop Sun Da Shuai from using torture, but Sun Da Shuai refused to release Paper Renqiang. Gu Yuan could only promise to sing a double reed with Sun Da Shuai to find Xiao Zhi, and that's how they managed to save Paper Renqiang. After Paper Renqiang's emotions stabilized, Gu Yuan questioned him about the situation, and that's when they learned that Paper Renqiang had seen the person who abducted the child and stole the paper figures he made to deceive the children. All those people were in the Ghost Market.
Gu Yuan and Che Su Wei disguised themselves as a couple and went to the Ghost Market to gather information. They first inquired with Paper Renqiang's employer and then asked about buying and selling children. They also watched a magic performance in the Ghost Market. After watching the show, Gu Yuan and Che Su Wei approached the leader of the troupe to inquire about child trafficking, but the leader refused to admit anything and only said that their place was for matchmaking.
Gu Yuan and Che Su Wei asked the leader to do a matchmaking calculation. After performing the calculation, the leader directly stated that they were not a couple and warned them not to cause trouble there.
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