Episode 4 recap: Gu Xinghe found the murderer.
Bao Rourou didn't believe it and said that she would find evidence to prove that Gu Xinghe was wrong. Bao Rourou came back to investigate but ended up being attacked by Chen Yan and taken away. Gu Xinghe learned that Bao Rourou had gone out and hadn't returned, and he felt that something must have happened to her. He rushed over and rescued Bao Rourou. Chen Yan was locked up in jail, and when Gu Xinghe asked how he knew it was him, Gu Xinghe mentioned that he had delivered tea to Zhao Si. However, there was no tea at home last time, so Chen Yan must have disposed of it. At that time, Gu Xinghe pretended to be sick and had a doctor come over, but he secretly returned through the window to create an alibi.
Gu Xinghe asked Chen Yan why he killed Zhao Si, and Chen Yan said it was revenge for his wife. Bao Rourou arrived and asked Chen Yan if Zhao Si had ever mentioned capturing a person named Hai Ren three years ago. Chen Yan claimed he had never heard of it. It was then that Gu Xinghe learned that Bao Rourou was searching for this person. Gu Xinghe approached Bao Rourou and admitted that he initially thought that capturing the murderer would lead them to what Bao Rourou was looking for, but they didn't find it.
Gu Xinghe asked Bao Rourou to become his disciple, mentioning that he was at least a great detective who could help her find people. Gu Xinghe had already suspected that Bao Rourou was being trained by someone and believed that as long as Bao Rourou stayed by his side, they wouldn't lack opportunities to catch her in the act.
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