The movie shows how the members of a poor family scheme to be employed by a wealthy family by infiltrating their household and posing as unrelated, highly qualified individuals.
The Kim family recommends one another as unrelated and highly qualified workers to take over as servants of the Parks.Â
Ki-woo tutors and seduces Parks' daughter Da-hye. Ki-jung renamed herself as "Jessica" and becomes an art therapist for Parks' young son, Da-song. Ki-taek is hired to replace their family driver. Finally, Chung-sook takes over as the Parks' housekeeper after the Kims exploit the peach allergy as tubercolosis of the long-time housekeeper, Moon-gwang.
When the Parks leave on a camping trip, the Kims enjoyed the luxuries of the Park residence just like owning the house of the Parks as their own. While having drinking and havung fun Moon-gwang appears at the door, telling Chung-sook she has left something in the house's basement. Through a hidden entrance to an underground bunker created by the house's architect and previous owner, it is revealed that Moon-gwang's husband, Geun-sae, has been secretly living underneath the home for over four years, hiding from loan sharks.
Due to severe rainstorm the Parks went back home early, and out of shock the Kims scramble to clean up the home before the Parks arrive, while a brawl breaks out between Moon-gwang, Geun-sae, and the Kims. The Kims sneaked out the house of the parks leaving Moon-gwang wounded at the bunker and trapped Geun-sae.
The Parks together with the Kims hosted a birthday party for Da-song. The party becomes bloody when Ki-woo enters the bunker with the scholar's rock to face Geun-sae, he found Moon-gwang dead, and he is attacked by Geun-sae, who hit him with the rock and escapes, leaving Ki-woo lying in a pool of blood outside the entrance to the bunker.
Out of anger because of what happened to his wife, Geun-sae stabs Ki-jung with a kitchen knife in front of the horrified guests. Da-song seizures when he saw Geun-sae and a struggle breaks out until Chung-sook fatally impales Geun-sae with a barbecue skewer. While Ki-taek tends to a severely bleeding Ki-jung, Mr. Park orders him to drive Da-song to the hospital. In the chaos, Ki-taek, upon seeing Mr. Park's disgusted reaction to Geun-sae's smell, he takes the knife and killed Mr. Park. Ki-taek escaped the scene, leaving his dying daughter on the lawn.
Weeks passed and Ki-woo woke up after a brain surgery . He and Chung-sook are convicted and put on probation for fraud. Ki-jung has died from her injury and Ki-taek is still wanted for Mr. Park's murder, has not been found yet. Ki-woo watches the Parks' home, sold to a German family unaware of its history, and sees a message in Morse code from a flickering light. It is from Ki-taek, who escaped and hide into the bunker by the garage. He's now the one who raids the refrigerator at night replacing the role of Geun-sae. It is also revealed that he had buried Moon-gwang in the backyard. He's been flicking the light every day, hoping Ki-woo will see it. He is still living in their small house with his mother, Ki-woo writes a letter to Ki-taek, promising to earn enough money and one day he will purchase the house and free his father.
Now, do you now know why the title is Parasite? It's really an award winning movie.
The movie won a leading four awards at the 92nd Academy Awards:
Best Picture, Best Director, Best Original Screenplay, and Best International Feature Film.
becoming the first non-English film to win the Academy Award for Best Picture.