Ki-woo Kim grows up in a cramped, poverty-stricken home with his father Ki-taek Kim, mother Chung-sook Kim, and sister Ki-jung. The family scrapes by doing small, low-paid tasks, constantly navigating the awkward realities of living in a tight space with minimal comforts. They watch the world from the edges of wealth, occasionally sharing a small joke about luck and opportunity, while chasing ways to improve their lot.
A glimmer of possibility arrives when Ki-woo’s affluent friend Min-hyuk visits, bringing a peculiar gift: a rock meant to bless its owner with wealth and prosperity. Min-hyuk explains that he has been tutoring the teenage daughter of a wealthy family, but his departure to study abroad means he will miss what could be a lifelong chance to be with her. He asks Ki-woo to take over the tutoring, promising to back him up with a recommendation. Although Ki-woo knows he isn’t officially qualified, Min-hyuk’s assurance gives him a shot, and Ki-jung helps forge the necessary documents so Ki-woo can interview for the job.
At the Park residence, Ki-woo encounters the very rich Park family—Mr. Park, his scatterbrained wife, and their children, Da-hye and Da-song. Ki-woo decides that winning over Da-hye will be essential, and his charm proves effective. The Park household soon notes a need for an art tutor for Da-song, who has a traumatic past involving a frightening “ghost” in the house that has contributed to seizures. Ki-woo’s sister Ki-jung also steps into the family’s life, adopting the alias “Jessica” and fabricating credentials to secure her own position. She instigates a plan to remove the Park family’s driver and, in a calculated move, frames Moon-kwang, the longtime housekeeper, by exploiting her allergy to peaches. This clever set of ruses culminates in the Kim family taking over the housekeeping roles, with Ki-taek posing as the new driver after Ki-jung secretly manipulates a moment that makes the old driver disappear from the scene.
The Kim clan’s fortunes rise dramatically as they integrate into the Park home. They celebrate their growing prosperity during a weekend when the Parks briefly leave town, providing the Kims with the chance to inhabit the massive house themselves. What follows is a tense, almost circus-like sequence of deception, as the Kims juggle their new roles and maintain their cover. The tension escalates when Moon-kwang, the fired housekeeper, returns in secret and unveils a hidden basement passage. There, she reunites with her husband Geun-sae, who has secretly been living in a bunker beneath the house to evade loan sharks. Moon-kwang’s discovery of the hidden space forces the Kim family to improvise, hiding the two guests in the bunker as the Park family unexpectedly returns.
The night unfolds with anxious energy: the Kims manage to keep up appearances at dinner while the two hidden guests are kept out of sight. The couple chosen to guard the secret battles a sense of fear as Moon-kwang’s presence lingers, and the drama spirals into a dangerous confrontation. In a sudden, brutal turn, Moon-kwang’s escape into the home’s upper floors leads to chaos, and a cascade of violence erupts. What began as a careful ruse becomes a catastrophe when a fight breaks out, and the basement secrets threaten to surface in the most deadly way. The result is a shocking sequence of events: a fatal blow is struck, a stabbing occurs, and the Park family is shaken to its core.
Ki-woo awakens weeks later in a hospital, having endured a coma from the traumatic night. He learns that Ki-jung has died, and that he and his mother face probation as punishment for their elaborate deception. The search for Ki-taek intensifies, but the father remains missing, elusive within the bunker’s shadowy confines—an echo of the earlier secrets now turning into a personal vendetta. Ki-woo slowly processes the costs of their actions, while the Park home sits elsewhere, its lights flickering in Morse-code signals that seem to hint at a living presence beneath the surface.
In the quiet hours of reflection, Ki-woo understands that his family’s ruse has permanently altered their lives. He resolves to keep the memory of their father alive, writing a hopeful letter that expresses a dream: to become wealthy enough one day to buy the Park house and reunite the entire family. He leaves the deciding symbol—the rock—at a river, a quiet gesture to mark both the end of one chapter and the possible beginning of another. The story closes on Ki-woo’s quiet determination to rewrite their fate, haunted by the past but driven by a vision of a future where the family can come together again, regardless of the odds.
