Yeonwha wasn't a psychopath. She was a Sadist. And she never raped anyone. Sexually assaulted? Sure, but did she rape anyone? No, I think even she draws the line on that. While Yeonwha saw pleasure in inflicting pain in others, she only found that pleasure in people she truly loved. She truly loved Yoo, Dahye, and Sohwa. She just expressed that love in a very questionable way. She saw those she loved as her blatant property, as toys she could play around with. But that doesn't mean she didn't love them. She most certainly did but was just not right in the head. Her fetishes ultimately corrupted her and she ended up seeing that as her way to express them. At this point, it seems that she has gotten the help that she's desperately been needing. I do think she's changed. After all, Ayeon was the one who made her realize that you can love without inflicting pain and objectifying them, so she definitely did have the capabilities of actually changing. But, it will be fascinating to see her slowly take that mask off. After all, old habits die hard.
Also, we know she didn't rape Dahye for sure cuz she's still a virgin even right now
Very nearly everything you just said is wrong.
In order, Yeonhwa was absolutely a sociopath. She was likely also a sadist, I'll give you that.
Yes, she did rape Dahye. Unquestionably. Non-consenting sexual intimacy is rape. Yeonsoo was dubious, but only because Yeonhwa had conditioned her to be extremely codependent. You saw how messed up she was even after she got free of Yeonhwa.
Yeonhwa got pleasure from manipulating others. If pain came with that, so be it, but the root was her sociopathy. Sociopathy differs from psychopathy primarily due to the dehumanization of others. It's more malicious than psychopathy because sociopaths often see other people like toys rather than just failing to empathize with them.
Even if it was love, and I'm inclined to admit that she probably "loved" Sohwa, it wasn't human love. They were her favorite toys. That's not "love" as you mean it, and it certain doesn't make any of the things she did because of it forgivable.
Yeonhwa was not right in the head, I'll give you that. She likely still isn't.
"Fetishes" is a horrible excuse, and I refuse to even dignify that with more than telling you it's absolutely false. My other refutations should together give you a sense of why.
Yeonhwa might have sought help, though likely not of her own volition. Medication cocktails, especially ones that involve potent antipsychotics like Yeonhwa would need, can be borderline hellish to maintain and are far, far from foolproof. Therapy would do little more than teach her an act to put on to pass as normal.
There was no indication of what you describe with Yeonhwa and Ayeon in the previous series. Nothing. On top of that, there has been nothing whatsoever to indicate that Dahye is "still" a virgin, or whether she was a virgin to begin with, in either series.
"If Dahye were to strike back at Yeonhwa for all the trauma that has added up to intimacy issues, insomnia, and both sleeping and waking nightmares, she would be well within her rights."
Not really. If that was the case then Ayeon has the right to show up on her doorstep and beat her as$ everyday. I always thought Dahye got off too easy at the end of the first series so seeing her with lasting trauma is pretty much a form of punishment she deserves. Let's not forget Dahye was more than just a simple bully: she physically abused Ayeon on a regular basis and manipulated and set up Sohwa to get raped just to get evidence against Yeonwha (she didn't care what happened to her). The only difference between Dahye and Yeonwha is that the former thought more of her image so was more fearful of getting caught and being in trouble, while Yeonwha didn't care about consequences at all. They're both psycho b!tches through and through though.
Oh and it's interesting that Dahye still hasn't shown any kind of remorse for what she did in the past. She's simply fixated on the fact that someone else actually messed with her. And really at this point, her and Yeonwha are practically the same in that they're both rapists now too: threatening someone so they'd sleep with you is still rape afterall.
I find it interesting that people really think that a person like Yeonhwa could change. Her behaviour in the last installment made it clear that Yeonhwa is probably a sociopath with little to no empathy for others. She tortured and raped two girls repeatedly, one of which was her sister, and showed no remorse for her actions when confronted with the severity of her crimes. Yeonhwa is very clearly a dangerous character.
However, sociopaths are not without feeling. Some are able to develop tenderness for a select few people and are able to act human, natural around these people with the goal of deceiving others. An example of someone like this is Ayeon who was utterly oblivious to what Yeonhwa was doing up until the very end of the series. Yeonhwa made a point of only showing a heroic and endearing side of herself that she knew would appeal to Ayeon. She treated no one else with that same respect because it is simply not in her nature to do so.
Fast forward to now, where she is romantically involved with Yeonyoung who has captured her interest. Yeonhwa is probably doing everything in her power to appear normal to Yeonyoung, for all we know. We have yet to truly see things from her perspective. So far, we've only seen her through Dahye and Yeonyoung's eyes, both of which are bias and unreliable parties.
If Dahye were to strike back at Yeonhwa for all the trauma that has added up to intimacy issues, insomnia, and both sleeping and waking nightmares, she would be well within her rights. Because sociopaths do not--cannot--change. Thank you for coming to my TED Talk.