Search padding
Results a search adds from outside the area or category you asked for, in order to fill the page, with nothing in the response marking them as such.
Measured on Naver Place: a query for dentists in 역삼동 returned 300 results of which 162 were in the area. Padding is reasonable behaviour for a consumer product and destructive for a dataset, because it is indistinguishable from a real match.