Despite being a Korean movie, most of the scenes in the movie take place in scenic locations of Vietnam like Da Lat, Hoi An, My Son, among which Hoi An and My Son are world heritages claimed by UNESCO.
Part of the backbone for the film includes the traditional Vietnamese dress, the Ao Dai. However, the version of the dress seen in the film is a much more recent (and the well known) creation (starting in 40's at the earliest). This contradicts the fact the legend of "Muoi" is a hundred years old. The Vietnamese co-producers should have forced the Korean director to change such a blatant mistake.