I did not read the novel completely I just read some random chapters , but according to what I have read, Lucios will marry a girl other than Paulina and his wife will give birth to a girl and then die. Lucios will be depressed because his daughter has to grow up without a mother, and that even with these circumstances he still loves Paulina .
Paulina was a friend of Lucios's wife when then she came to console him, lucios almost pushed her down, but with difficulty he grabbed himself and shouted at Paulina to leave immediately and that Polina became depressed for two reasons because her friend died and because she thought that she overestimated her position with Lucios
Sorry, I read the novel until here, I could not bear to finish it
Here is the link in case you want to read it
https://wuxiaworld.site/novel/the-emperor-and-the-knightess/
If it continue like the novel i think I’ll drop it ╥﹏╥