Their lives take a dramatic turn when 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 begins to tutor the Parks' young daughter, soon followed by his sister Ki-jung, who poses as an art therapist. The Kims gradually infiltrate the Parks' lives, with Ki-taek and Chung-sook posing as the Parks' housekeeper and driver, respectively.