She wasn't the first/isn't last victim...

This may be obvious, but I think its worth mentioning (also contributing to the darkness of the whole film) that it seemed she wasn't the first nor will be the last "victim" of that family.. That entire scene of the woman committing suicide at the beginning (her story unknown), the vetting process that the older Housemaid conducted prior to her employment, the maid clothes that fit her (b/c they hire only younger women), the fact that the older housemaid/mother-in-law's actions seemed almost rehearsed with knowing what to do, the fact that the housemaid quit because she finally had seen enough ruined lives... And then by the end of the film with the new housemaids at the daughter's birthday party being the exact same type, which were young attractive females. All of this seems to represent the hopelessness of the poor and adds to the whole invulnerability concept of the rich. Very dark film..