Responses
Oooh here I tought that the mistress might be someone paid by the short haired girl to make the whole revenge drama, as she so aware of the red haired girl when she taking their pic. Idk. Why involved that brunete? She just another victim of that manwhore. (︶︿︶)=凸. And I kinda sad for that redhead whether her feeling is same as the short haired girl stated?
we never get her pov (not yet maybe) on how her feeling toward that short haired girl.
dude I can't remember their name I goes with their hair color instead.

I don't know.. I have a feeling that the mistress could really be that betrayed sister the short-haired girl is taking revenge for. She said she didn't see her face in a while, which implies she possibly would not recognise her. The sister could put herself together, change her image and planned a revenge on her own. Her behaviour is not normal for a mistress and the look on her face is honestly disturbing, like she's not in her right mind. In that dress scene she gave me a real psycho vibe. Like she planned to literally replace the wife and take everything form her, like in her mind she took everything from her in the past. Just wait a minute and we'll see that she replaced the wife's face on that wedding picture with her own xD