Paris.
36 Riverside Road, Paris, is home to the French Police Headquarters, so many also refer to the French Police Headquarters as No. 36 Bureau, and Gao Yang's gun is stored in the evidence room of No. 36 Bureau.
Since the gun is here at No. 36 Bureau, Gao Yang obviously also has to be here.
Gao Yang sat opposite No. 36 Bureau, facing the main entrance, at a coffee shop, and Gao Yang was drinking coffee in the café.
Not only Gao Yang was there, but everyone from Satan and Black Demon except Number Thirteen came.
After Gao Yang finished a cup of coffee, he snapped his fingers at the waitress, pointed at his empty cup to indicate a refill, and, with eyes red, said to Yake beside him, "How are the French police?"
Yake whispered, "Terrible! Just terrible, extremely terrible!"
