
The sequel is just tragic.
Basically the brother who FL ended up (basically settled with if we are going to be honest) ends up cheating on her and falling in love with a "virginal" younger girl who is a violinist. I suspect its because he liked that in his POV this girl didn't have the same "baggage" as the FL does and to her he's the only one in her eyes. Eventually I think he does dump the FL for her. He truly is a piece of shit.
The older brother takes the opportunity to swoop in and start fucking the FL again. He from what I saw in the raws he basically gives the FL impression and he and his wife aren't together anymore and are divorcing (lie).
When she sees a photo of them together as a family on social media she realises its not true and breaks down. Also, he is still very much sexually active with his "ex" wife. He too is a piece of shit.
The FL sleeps with her neighbor who seems like a nice guy (as of now) but so far not much progressed for them and she's still single.
It's now hinting in recent chapters her new lover is going to be a High School student which is just a mess.

Cheated on her husband and then assumed he was cheating on her too to "make her feel better" and basically got divorced but was basically still married in all but name as far as the public was concerned. Strung along her lover 5 years and is "shocked" that her ex husband isn't as much as of pushover as she is use to because he says he doesn't want to raise her boyfriend's kid in their house. This bitch deserves no one.
Is that the ML's grandma? Or step grandma?
Grandma
yes and the blonde man that appeared is his father