A Tale of Two Sisters

• The Korean title Janghwa, Hongryeon ("Rose Flower, Red Lotus") comes from a Joseon-era folktale already filmed in Korea in 1924, 1936, 1956, 1962 and 1972 — Kim Jee-woon's 2003 version is at least the sixth screen adaptation of the same story (Wikipedia, ScreenRant).
• On a $3.7 million budget it became the highest-grossing Korean horror film ever made and the first Korean horror to get a US theatrical run, opening in LA and New York in December 2004 via Tartan's Asia Extreme line; worldwide gross was roughly $1.05 million (Wikipedia, the-numbers, Dazed, scifijapan).
• DreamWorks acquired the remake rights as early as 2003 — before most of the West had seen the film — and the Hollywood version landed in 2009 as The Uninvited, starring Emily Browning and Elizabeth Banks, with the sisters' ages reversed (Wikipedia, ScreenRant, scifijapan).
• Im Soo-jung originally auditioned for the younger sister Su-yeon; Kim wanted Jun Ji-hyun for the lead but she declined because she found the script too scary, so Im was moved up to play Su-mi and carry the film (Wikipedia, ScreenRant).
• A darker alternate ending was shot and cut: Su-mi overdoses on pills to reunite with her dead mother and sister, the camera lingering on an empty bottle and her body — Kim deemed it too depressing and removed it (TV Tropes, ScreenRant, SlashFilm).
• Jordan Peele assigned the film to Lupita Nyong'o and the Us (2019) cast as one of eleven horror movies he required them to watch so the production would share 'a common language' (Dazed, IMDb).

• The film is often interpreted as a metaphor for mental illness, particularly dissociative identity disorder (DID) or schizophrenia. Su-mi's fragmented perception of reality, her imagined interactions with her deceased sister, and the blurred line between hallucination and truth suggest a mind grappling with trauma. The stepmother, Eun-joo, may represent an externalized manifestation of Su-mi's guilt or self-loathing, embodying the 'monster' she fears she has become.

• Some analysts argue that the film critiques patriarchal family structures and the suppression of female voices. The stepmother, Eun-joo, is initially framed as the villain, but her character may symbolize the scapegoating of women in abusive or dysfunctional households. The father's passivity and eventual complicity in the family's secrets reinforce the idea of systemic silence around domestic trauma.

• The recurring motif of the 'red dress' worn by the ghostly sister, Su-yeon, has been linked to themes of martyrdom and unresolved grief. In Korean culture, red is associated with both celebration and death, and the dress may symbolize the inescapable presence of the past. The film's nonlinear storytelling could reflect the cyclical nature of trauma, where the past and present are indistinguishable.

• A less explored theory posits that the entire narrative is a supernatural ghost story, with Su-yeon's spirit genuinely haunting the household. The film's ambiguity leaves room for this interpretation, particularly in scenes where Su-mi interacts with her sister in ways that defy logical explanation. The stepmother's cruelty and the father's neglect may have created a 'haunted' environment, where the dead linger due to unresolved emotional pain.

Su-mi comes home from an institution to a lake house that's gone wrong — her devoted little sister bullied raw by a brittle, smiling stepmother, her father checked out and useless. Something moves under the sink. Blood seeps where it shouldn't. Dinner turns into a screaming match nobody walks away from. Kim Jee-woon doses every gorgeous, William Morris-papered frame with dread, then pulls the rug: the cruelty, the ghost, the grief are all the same wound, and the house has been empty the whole time.