I think the plot for omega neul should be fine! You might think it may be too much but a reason why people usually are iffy about it is because they usually don’t like the main character to be with someone who is directly abusive (ie if bin were to be the abusive alpha). But in this case, Neul would be escaping the abusive alpha in favour of someone who is sweet and treats Neul actually well (ie bin). That being said, a manipulative main character isn’t always bad (a lot of fics I thoroughly enjoyed had a manipulative/ slightly immoral main character), it’s mainly about how you write out that character and handle the situation they’re in which makes the plot enjoyable, even if it is angsty. So don’t be too worried about it!