"Parasite" tells the story of the Kims, a poor family living in a cramped semi-basement apartment in Seoul. The family, consisting of father Ki-taek, mother Chung-sook, son Ki-woo, and daughter Ki-jung, struggle to make ends meet by folding pizza boxes. One day, Ki-woo's friend, a university student, recommends him for a tutoring job with a wealthy family, the Parks. Ki-woo poses as a university student and is hired to tutor the Parks' young daughter in English. As Ki-woo becomes more comfortable in the Parks' mansion, he recommends his sister, Ki-jung, as an art therapist for the Parks' young son. The Kims gradually infiltrate the Parks' lives, but the boundaries between exploitation and symbiosis begin to blur.