In a South Korea marked by extreme social inequalities, a lower-class family, the Kims, struggles to survive in a miserable neighborhood. The father, Ki-taek, and the mother, Chung-sook, see their situation improve slightly when their eldest son, Ki-woo, secures a job as an English tutor for the wealthy Park family. Ki-woo, cunning and ambitious, decides to introduce his family to the world of the rich and begins to orchestrate a series of deceptions.
Little by little, the Kims use their ingenuity to pose as qualified professionals. Ki-jung, the sister, becomes the family's art therapist, while the parents infiltrate as a chauffeur and housekeeper, respectively. The Park family, trusting and carefree in their privileged class, has no idea what is brewing under their own roof, while the Kims enjoy an ostentatious lifestyle.
However, when a dark secret is revealed in the luxurious Park mansion, tensions between both families explode. What started as a game of social simulation transforms into a chilling thriller, where the class struggle becomes visceral and ruthless. The film explores ambition, inequality, and survival, leaving the audience with an unsettling reflection on human nature and the limits some are willing to cross. Amid humor and drama, a dark and disturbing story unfolds, highlighting the divisions that still persist in modern society.