A Tale of Two Sisters is a 2003 South Korean psychological horror film written and directed by Kim Jee-woon. The film is inspired by a Joseon dynasty-era folktale entitled "Janghwa Hongryeon jeon", which has been adapted to film several times. The plot focuses on a recently released patient from a mental institution who returns home with her sister, only to face disturbing events.

Psychological horror is a subgenre of horror and psychological fiction with a particular focus on mental, emotional, and psychological states to frighten, disturb, or unsettle its audience. The subgenre frequently overlaps with the related subgenre of psychological thriller, and often uses mystery elements and characters with unstable, unreliable, or disturbed psychological states to enhance the suspense, horror, drama, tension, and paranoia of the setting and plot and to provide an overall creepy, unpleasant, unsettling, or distressing atmosphere.