I watched the whole drama just to confirm how bad the story is. In order to create a fresh narrative they portrayed a stereotypical narcissist who is cruel and toxic in every relationship she enters, and in the end, she becomes an even worse person. It's basically a twisted retelling of female empowerment, which fails miserably as a romance and it is offensive as a feminist plot. I would never classify this story as 'polyamory' because that would mean that there is honesty and acceptance from all parties involved. What FM did was lie at the beginning, take advantage of the emotional dependence of the ML when they find out about each other, and toss them aside when the hype of the relationship passed. Traditionally we see the same situation with the man in the manipulative role but it doesn't make it acceptable by reversing the genders (that's why I think it offends feminism to say that this is some kind of "girl power"). There is no ending that would validate this plot but the authors certainly went above and beyond to create the worst possible one. And if you relate to the story on any level, I strongly suggest that you seek psychiatric help.