Episode 15 recap: Pan Da Hai arrived in Jiecheng.

The captain mentioned that when Lin Ying came over earlier, she showed them a photo of Wang Da Yong, so as soon as he saw this ID card, he immediately recognized it as Pan Da Hai. Pan Da Hai confirmed that it was indeed him. Cheng Bing and the others also knew that Pan Da Hai had come here and found it too coincidental that they had just located Zhang Qiao when Pan Da Hai showed up. It must be related to Wang Da Yong's case.

In Jiecheng, they salvaged a vehicle with a corpse inside and immediately sent it for examination. Pan Da Hai received a call and rushed to Jiecheng. The captain mentioned that when Lin Ying came over earlier, she showed them a photo of Wang Da Yong, so he recognized him immediately upon seeing the ID card.

Pan Da Hai came over and confirmed it was him. The information about the corpse in the car has been sent to the provincial authorities for examination, but the results will take two more weeks. Cheng Bing and the others are also investigating. There's an elderly person named Huang from the Gemstone Appraisal Association Center who happened to be dining in their vicinity. He mentioned that he had seen a piece of Shi Tou with violet glass inclusion before.

Huang said that the Shi Tou was presented in 2005. Cheng Bing was also surprised because they had heard it was from 2008. Huang mentioned that Gu Erqiang and Yi Cai were both present at the appraisal scene back then. Cheng Bing and the others discussed this matter and believed that many things must have happened concerning this Shi Tou between 2005 and 2008.

Cheng Bing instructed Shi Tou to keep a close eye on Zhang Shuqiao, while the others continue their investigation. Pan Da Hai and the others called Zhang Shuqiao for questioning. Zhang Shuqiao claimed that it was all Gu Erqiang's doing, and she wasn't very clear about it. Furthermore, Gu Erqiang had disappeared a few years ago and hasn't been seen since. They don't know what he might have done. Cheng Bing and the others also knew that Pan Da Hai had come here and found it too coincidental that they had just located Zhang Shuqiao when Pan Da Hai showed up. It must be related to Wang Da Yong's case. Pan Da Hai called Cheng Bing and learned that he was still operating a food stall here, so he said he would come to find him.

Cheng Bing asked Pan Da Hai why he came here and suggested that there must be other connections between Wang Da Yong, Gu Erqiang, and Zhang Shuqiao. He wondered if Wang Da Yong had committed another murder here. Pan Da Hai stated that Cheng Bing had no authority to ask and he had no right to answer, asking him not to interfere with the matter anymore.

Cheng Bing mentioned that he was providing them with clues and informed Pan Da Hai about what Huang had said. The police department called Zhang Shuqiao and asked her to come for questioning. Zhang Shuqiao had no choice but to go. Before leaving, she instructed her younger brother that if she hadn't returned by evening, he should go find Ah Guang to rescue her.

Pan Da Hai and the others asked about the incident involving the raw gemstone in 2005, and Zhang Shuqiao reluctantly admitted that she was indeed present at the time. A person came to sell a piece of violet glass inclusion material and demanded 8 million in cash. However, they couldn't agree on the price, and Gu Erqiang became angry and wanted to take the material by force.

Zhang Shuqiao identified Wang Da Yong from the photos as the person who came to sell the material. Shi Tou borrowed a car from a rental agency, and while they were here, the rental agency girl had stomach trouble and came to use the restroom. She saw the map they had posted. Shi Tou didn't want to keep it from him anymore and told him about the investigation they were currently conducting.

Shi Tou and the others came to find Cheng Bing and informed him about the matter. Cheng Bing didn't consider it something to hide, so he accepted the information. Zhang Shuqiao's younger brother came to ask Mr. Qian for money to rescue his sister, but Mr. Qian refused. Cheng Bing approached Zhang Shuqiao's younger brother and pretended to call Shi Tou, acting as if he were Pan Da Hai, and said he would release his sister. Zhang Shuqiao's younger brother then shared what he knew with Cheng Bing. He mentioned that someone had found Gu Erqiang's ID card and called, but he thought it was a scam and ignored it.