Eun-yi is a middle-aged divorcee whose marriage fell apart due to her infertility. She is hired as an upper class family housemaid, and is tasked to take care of the family's young daughter and her pregnant mother, Hae-ra. Byung-sik is an older housemaid who has been with this family for a long time and holds many secrets. But soon enough, master of the house Hoon takes advantage of his social position by slipping into her sheets. Hoon's visits become frequent and Byung-sik reports the affair to Hae-ras mother Mi-hee, who plots to give Hae-ra control over her husband. Soon Eun-yi miraculously becomes pregnant and wants to keep the baby. This is discovered by the family and she is forced to have an abortion by Mi-hee despite Eun-yi's plea to let her keep the baby and leave the house. Mi-hee's plot backfires when Hoon scrutinizes her for terminating his child, even if that child is conceived illegitimately. Her forced abortion turns Eun-yi's mental condition for the worst and she decides to take the matter into her own hands.