I saw it ages ago, so I can't really remember it well.
Benz's father, I don't know why but he thinks that Benz is not he's daughter. So Benz grown up hating her father, and do anything to piss him off.
Aum is the servant at Benz house, so she decided that if she hook up with Aum, her will will get really mad. So she got pregnant and so on, but in the end she becomes crazy.