Yeah, in FL past life she was married to red head and he was her "perfect husband", so her niece wants him to herself, because in her past life she was married to the ML(The white haired one) and she loved him, but he never loved her back.
I'm honestly dropping this for now and letting marinate to the parte where FL gets married to ML, because I can see that niece of hers.
He never betrayed her, that's why is sad, in both lives he was annoying, but he loves her. The novel isn't so far after her marriage with the ML, so for me it's impossible to guess the plot, because somethings are happening that I did not expect at all. The only thing I'm grateful for is that her niece is as dumb as a door, really slow, but a cunning snake.
I'll leave the link to the novel for you
https://fourseasonsforest.wordpress.com/husband-thief/

I'm truly utterly disgusted at this fkng niece, she is such a bitch. It's so sad, I've just read 165+ chapters of the novel, because I can't wait, and wanted to cry because of Kishin and her baby T.T
I don't know what the author plans to do, but the male lead may never be as loved as past life Kishin by the readers and the protagonistas well. Overall it was really satisfying to see the niece and the ex husband go trough Classie's engagement and marriage.
The niece must be in love with her or something, it's not normal to be obsessed with someone like this to the point of trying to destroy every good thing Classie ever received.
I've change my mind, Dernick is really cute, poor husband he asked her: “If Kishin and I both fell into the water at the same time… who would you save?” and she lied she'd save him first, but he knows she is lying and becomes sad. It serves him right because before the marriage he'd tell her it as a marriage of convenience all the time.