The Housemaid (2010)

Eun Yi is a playful young woman, a good match for a job as nanny to a precocious child, Na Mi, the daughter of a wealthy couple, Hae Ra and Hoon. Hae Ra will soon have twins as well. The majordomo, Mrs. Cho, is the household's cold stone center. Before long, Hoon seduces Eun Yi, and when Mrs. Cho tells Hae Ra's mother about the affair, Eun Yi is up against women with wealth, power, and no conscience. Can Eun Yi maintain her dignity and perhaps even put the family in their place?