Unless her soul was forced into that body causing 2 spirits in 1 body

Hope this explains why they'd produce an heir and the mindset of nobility
Just not being the legitimate wife's offspring makes you illegitimate, also a change in family social status ie fallen noble, commoner from the beginning, or in the most screwed up way: A child who was born between legitimacy, but a parent dies so the other remarries thus the child loses legitimacy because they do not belong to the noble title holder and legitimate spouse

As to why its because (corrupt) nobles like to lord over people, beauties are possessions not people (sex doll), commoners are tools for money, and knights are meat-shields for protection and enforcement. Nobles on a power trip will even think they are more important than the king. The only thing that matters is if their possession brings power ie a wife brings allies
Even for imperial families princes/princesses are used to ally with their own nobility (if the internal power is weak) or to outside nations (if external power is weak)

Its possible
the professor has a connection to her teacher (but when)
story has to be connected in some way
She lost her memories and its connected to her teacher (probably didn't want her to suffer?)
Professor is looking for unknown #3
Professor was the one who stopped the spirit in L'Otan

considering how smart "sherlock" is, you'd think she'd realize that moriarty has never been associated with a criminal group, and exists to get rid of criminals by nefarious ways

that was fukt abandoning them on first "real" day of the job

... Do you finally get it now?

A kiss, close to the lips, to a woman he thinks not as his sister

this bit of her not realizing he loves her as a woman and not sister is getting annoying

we all know yus will slay whoever steps up

Honestly Ran or "Lan" is a matter of annunciation of R/L in korean and Yustav vs "Eustaph" is the same thing... Its like some go by Corey vs Kory
But it is annoying

was thinking the same... Just like why is the MC still respecting crown prince. The king has slighted their dutchy is the prince has already disrespected the other dutchy by running on wife. Who knows how many other high powers hes pissed off with greed. Not to mention magicians will never invade, and they'd have no means of keeping the beasts at bay considering they have no way of doing the door ceremony even if they knew about the ring

isn't the emperor afraid of retribution for allowing a secret attack

regret comes quick with her as a dance partner

Due to the novels title my conclusion is they would have to get together... Afterall the viridescent crown is given to the heads legal wife
Previously explained

caught talking good behind his back

Dreams can be a bitch... You never lie
Also kinda heartbreaking for him to hear... He's gotta know she had him sent away so he couldn't be a target for hatred right

everybody seems to think MC is related to ML... Shes not...
Shes Man "X" and her mothers daughter
Mother remarries a duke whom already has a son
Mother and duke then have a child making the only relation between the 3 children the last son whom shares blood with everyone
Then mother, duke, and their son all die removing MC from family tree

communication mirror is probably dead :(

Became vessel for "good god" or chiyu vessel

better than my reply