There are two scenes within this movie which show a large scar, or burn, on Jeon Do-yeon's upper thigh. Asked about that by Hangul Celluloid website, director Im Sang-soo said: "Jeon Do-yeon does, in fact, have a scar there, and before filming began, she mentioned the scar to me because she knew that there were many scenes involving nudity within the film. I didn't have a problem, or filming issues, with it at all, but as shooting progressed, I felt that the scar matched ideas within the film very well, so it is true that I had a couple of scenes specifically focusing on it. We could have erased it with computer graphics, but I talked to Jeon Do-yeon about it and we both agreed that it matched the film so well that it should be kept in."
Around 1 hr 9 min, when Eun-yi is sitting on a bed, in the background is a large piece of art with English words faintly visible on it. The words are a quotation from Nathanael West's novel Miss Lonleyhearts, a work with many themes that mirror those in this movie such as depression, lonliness, drinking, adultery, and physical abuse.
This movie is a remake of 1960 Kim Ki-Young's The Housemaid
An early draft of the screenplay was written by Soo-Hyun Kim, but after director Im Sang-soo had edited the script so heavily that Kim considered it to be entirely Im's own work, she decided to leave the project and publicly expressed her dissatisfaction.