Kim Ki-taek (Song Kang-ho), an unemployed driver, lives with his wife Choong Sook (Jang Hye-jin) and two college-age children in a shabby semi-basement apartment. The family struggles to make ends meet by folding pizza boxes and leech off the wi-fi connection of their neighbors.
One day Ki-taek’s son Ki-woo (Choi Woo-shik) is having drinks with his friend Min (Park Seo-joon) who is currently employed as an English tutor for the sophomore daughter of a wealthy family. Min is leaving to study abroad and suggests that Ki-woo take his place since he has been studying for the university entrance exam unsuccessfully for the past four years, although he tells him that he plans to ask the daughter to be his girlfriend, once she enters university.
Jobless, penniless, and, above all, hopeless, the unmotivated patriarch, Ki-taek, and his equally unambitious family–his supportive wife, Chung-sook; his cynical twentysomething daughter, Ki-jung, and his college-age son, Ki-woo–occupy themselves by working for peanuts in their squalid basement-level apartment. Then, by sheer luck, a lucrative business proposition will pave the way for an insidiously subtle scheme, as Ki-woo summons up the courage to pose as an English tutor for the teenage daughter of the affluent Park family. Now, the stage seems set for an unceasing winner-take-all class war. How does one get rid of a parasite? Written by Nick Riganas