"Parasite" tells the story of two families with different identities and statuses: Ki-taek, an unemployed father played by Song Kang-ho, asks his eldest son (Choi Woo-sik), who is the hope of his family's livelihood, to go to the home of President Park (Lee Sun-kyun), the president of an IT company, to apply for an after-school teacher, and a series of unexpected events follow.