- Song Kang-ho as Kim Ki-taek (Mr Kim; 김기택; Gim Gitaek), the Kim family father who is hired as Park Dong-ik's chauffeur
- Lee Sun-kyun as Park Dong-ik (Nathan; 박동익; Bak Dongik), the Park family father
- Cho Yeo-jeong as Choi Yeon-gyo (Madame; 최연교; Choe Yeongyo), the Park mother
- Choi Woo-shik as Kim Ki-woo (Kevin; 김기우; Gim Giu), the Kims' son who is hired as Da-hye's English tutor (Choi said the character is "intelligent but does not have the vigor needed to succeed in examinations")[11]
- Park So-dam as Kim Ki-jung (Jessica; 김기정; Gim Gijeong), the Kims' daughter who is hired as Da-song's art therapist
- Jang Hye-jin as Chung-sook (박충숙; Bak Chungsuk), the Kim family mother who is hired as the Parks' housekeeper
- Lee Jung-eun as Gook Moon-gwang (국문광; Guk Mungwang), the Parks' housekeeper, who also worked for the house's architect and previous owner (Bong Joon-ho said her relationship with the architect and parts of her story "that happen in between the sequences in the film" will be explored in the spin-off TV series)[12]
- Park Myung-hoon as Oh Geun-sae (오근세; O Geunse), Moon-gwang's husband
- Jung Ji-so as Park Da-hye (박다혜; Bak Dahye), the Parks' daughter
- Jung Hyeon-jun as Park Da-song (박다송; Bak Dasong), the Parks' son
- Park Keun-rok as Yoon (윤; Yun), Park Dong-ik's chauffeur
- Park Seo-joon as Min-hyuk (민혁; Minhyeok), Ki-woo's friend[13]
- Jung Yi-seo as a pizza parlour owner
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