"The Housemaid" you're referring to could be one of several films with that title. A well-known film titled "The Housemaid" (also known as "The Housemaid's Diary") is a 2010 South Korean film directed by Kim Ki-duk. If this is the one you're interested in, I recommend looking for it on the platforms mentioned above or purchasing it from a legitimate source.
(하녀), here is a summary of the film's details, plot, and official streaming options. Movie Overview Im Sang-soo Jeon Do-yeon, Lee Jung-jae, Youn Yuh-jung, and Seo Woo Erotic Psychological Thriller 107 minutes download 18 the housemaid 2010 unrated kor top
For movies in their original language with subtitles or dubbed versions, these are usually available through official channels. "The Housemaid" you're referring to could be one