Serafim

This. I'm sure, all the haters are probably teens or people that already got betrayed for a significant one.

This part didn't happen in the novel. I think before the last showdown, they will probably change the end.

noble idiocy trope

Main Villain is focusing on her because of ML. ML is trying to distance himself of her.

Right after

Yes. There's some flashbacks. It's even better if u don't watch PA.

Male Lead

With ML

ML is a "genius", FL is just a rookie inspector.

No, but he will move himself eventually. No, like I said, FL just see 2ml as a shadow of her past, maybe doesn't seems like it, but she already move on in terms of love with 2ml, now she is just worries about him as a old friend.

It's doesn't happen.

Yes

Husband, it's a marriage first, love second, however until the end 2ml will have no chance, in FL pov 2ml it's just a shadow of her past.

HE. No one dies.

They end up together, 1 year later. Before she goes, they make a promise that, when she is ready to be with him in the future she would come back.

is FL step mother

Like I said. The lesser evil, FL and her ex-boyfriend started dating 1 week before he goes to Boston, they knew each other just 1 month before that, u can see that's she didnt feel anything for him and just starting to like him when ML reply. That's why she is mad, she is mad because she lost 7 years crying for someone that didn't really exist.

Don't forget, that it was her ex-boyfriend that ask ML to reply to FL initially. ML just follow up the conversations, because FL was depressed and need someone to talk to, he did help her. ML is wrong, but it was the lesser evil. She regain her live to life because ML and her grandmother.

This is one of the most flawed FL u will watch in the last decade. She is an indecisive, prevaricator and selfish person.
This contrast is so noticeable because ML is the opposite.
This will have the same ending as The Third Charm drama, a open ending.

his side plot was just a comedy relief