After Ding Zhaozhao, Chu Bufan and the girl who looked like Wen Sixing were introduced in the restaurant box, they learned that the girl's name was Wei Zi and she was a traveling doctor.But Chu Bufan was full of doubts about Wei Zi, but Ding Zhaozhao transferred his trust in Wen Sixing to Wei Zi and handed the incense ashes to Wei Zi for identification.Unexpectedly, Wei Zi really recognized the herbal medicine contained in the incense ash. After learning that the medicine was used to repel mosquitoes, Ding Zhaozhao became more certain that the injuries caused by “Black Mist” were poisoning, and invited Wei Zi to join the team that solved the case..Ding Zhaozhao brought Wei Zi to Wen Sixing's former residence for resettlement.He Yuefei also found out Li Zifeng's identity and secret as a former member of the capital.