Eun-yi is introduced into Hoon's mansion as an au pair. Hoon enters her quarters late at night with expensive wine and coerces her into sex. The naive Eun-yi mistakes this exploitative encounter for genuine affection.
Byeong-sik discovers the affair and Eun-yi’s resulting pregnancy, notifying Hae-ra’s mother, Mrs. Park. Mrs. Park and Hae-ra engineer an "accident," causing Eun-yi to fall from a high indoor balcony while cleaning the chandelier. When the fall fails to end the pregnancy, Mrs. Park covertly poisons Eun-yi’s medicinal tonic, inducing a violent, agonizing miscarriage.
Hoon attempts to pacify Eun-yi by offering her a large financial settlement. Realizing the family sees her baby and suffering as mere accounting liabilities, Eun-yi rejects the payment. She returns to the house during a family gathering. Standing on the indoor balcony where she was pushed, she loops a noose around her neck, drenches herself in accelerant, ignites herself into a human fireball, and leaps over the railing in full view of Hoon, Hae-ra, Mrs. Park, and little Nami.
The film closes with a surreal, dreamlike birthday party on the snowy lawn. The family speaks stilted, artificial English, drinking champagne around a lavishly dressed Nami, demonstrating their refusal to acknowledge the human devastation on which their lifestyle rests.