At the critical moment when Xie Wenchao and others were searching the house, Gao Hu covered for Gu Yizhong, saying that Gu Yizhong had been drinking with him tonight.Before he finished speaking, Gu Yizhong appeared in pajamas.Although Xie Wenchao's doubts remained, he had no choice but to leave because he had no evidence.Zhou Zhifei tortured Gao Hu and forced him to reveal Gu Yizhong's whereabouts.Gao Hu gritted his teeth and refused to admit it, protecting Gu Yizhong.Zhou Zhifei asked Gu Yizhong to hand over Ding Jiansheng to him, but Gu Yizhong dealt with him and insisted that Ding Jiansheng was not in his hands.On the other side, Zhou Zhenwu successfully bought the medicine according to what Ding Jiansheng said.Xiao Ruotong thought he should be sent back to Shanghai, but Hu Zhiping said that Ding had some skills and connections with the Japanese, and wanted to detain him for another two days and ask his superiors for instructions before making a decision.Gu Yizhong approached Huang Xinzhai and extracted information about cell No. 8 from him, which was intertwined and complicated. In order to confirm his conjecture, Gu Yizhong used Lu Zheng to pass the information to Xiao Ruotong.