Which episode is Qin Gui calling in sick with an iron lock?

In the 68th episode of Zhongjing Yuefei, Xiaoman poisoned the wine, and Qin Gui turned to accompany him to drink. Qin Gui picked up the cup, but didn't drink it. Li Xiaoman tried to persuade him. Just as Qin Gui was about to drink, he learned that Tiesuo was ill, and Qin Gui took Tiesuo to see a doctor.

Huang Xiaoming, Ruby Lin, Gallen Lo, Cheng Peipei, Shao Bing, Liu Shishi, Zhang Yin, Liu Chengjun, Ding Zijun, Liu Dongjian and Yue Fei (played by Huang Xiaoming) have been planning and preparing for nearly ten years.