If it were merely this, Zhao Changhe felt that Chichi's action of questioning the Oiran in a brothel was somewhat off course.
Here is where… is the City of Evil.
The Oiran might not really be an Oiran; she could be some venomous female antagonist hiding her identity here, and at the very least, the brothel's owner definitely is—as these women are all subordinates trained by some powerhouse. For instance, Qianqian clearly knew she was "trying to harm the gentleman next door" and was "eavesdropping," yet she showed no reaction; to them, such incidents might be very common.
Do you expect these women to provide you with genuinely useful information? Or expect her to help you?
Trying to replicate your approach in Yangzhou when you were looking for such as smoke?
No no, Chichi almost never speaks the truth on ordinary days; there must be another purpose behind her actions—most likely it has all been an act, pretending to gather information from all directions as a newbie.