JN writes XX a letter saying something like her heart beats faster when thinking about him. The same thing happens to him when he thinks of her so he calls a doctor to check them out, thinking they have heart problems. :-).

JN's grandparents from father's side and his entire family were convicted (innocently) by the previous emperor. Her grandfather divorced her pregnant grandmother to let her escape the exile. The grandmother's sister (Mrs Jiang) agreed to pretend to be pregnant and raise the child she gave birth to as her own, to give the child a better future. The grandmother died while giving birth to JN's father and her father was then adopted by his uncle and aunt (Mr. And Mrs. Jiang) who pretended he was their child. He always assumed they were his real parents.

Mrs. Jiang always treated her adoptive son well. It was only when he got married that she started disliking his wife and children. Part of the reason was that MC and her brother were much better than her real grandchildren.

He has a very unhappy marriage with YS and divorces her pretty fast.

YS is quite pro-active during their wedding night, because of her experience in her previous life, resulting in him thinking this is not her first time and distancing himself from her. At that point I kinda felt sorry for YS.

XJ loses his position as first heir of the duke after JN gives birth to children. It was always assumed the duke would never have children.

He then starts dreaming about his happily married life with JN and regrets breaking up with her. He comes to the conclusion that YS can see the future. However JN is already happily married with children at that time. He never acts against JN. He finally marries someone who somewhat resembles JN.

-Aunt Zhang decides to poison MC so she can't have children after she visits her home after 3 days of marriage. MC notices this right away and still takes the poison (she knows the antidote, quite s*upid it seems to me, what if she has already become pregnant in these 3 days, will this then affect her pregnancy?, but whatever). She pretends to let everyone at the table eat this poisoned food and then discloses it has been poisoned. Her aunt's servant is executed and her aunt is exiled.

-MC finds out her uncle ordered bandits to kill her parents so he can get his hands on their money. He is jealous of his brother. The bandits are hunted and killed. The uncle loses his title and his official job and that's it.

they are engaged, affectionate (have hugged, held hands, pecked each others faces, sent love letters), but not yet married (supposed to marry in less than a month)

The "fitting the wedding dress" scene. Even for a loose no-dinasty-as-a-model and generic 'Ancient Setting' with a mix of Xianhuan elements (the zombie apocalypse powers), I never saw this modern element implemented anywhere.

The 'not being filial', 'being physically strong' or 'not fitting the standarts of an ancient lady' are still fine. Many stories have this loose type of setting when the focus of the story is the romance and the face slapping