
Meh. Pauliana doesn't really care if he gets married to 3 other women. To her, she's just a knight doing her duty.
Also, after he married the three women he left the kingdom for some business and put Pauliana in charge of his wives' security. All four of them became close and got along with each other. The 3 wives also know that Lucius is only in love with Pauliana (a bummer that the person in question doesn't though). It is a dictionary definition of political marriage.
In hindsight, the 3 wives were more like a harem for Pauliana hahah

Did some bad complications happen uhmm like pauliana's feelings kinda hurt when lucius maried the 3 wives? Im really scared of thinking that lucius will have ....chi-children with them i hope not??? And uhmmm will paulina and lucius have realtionship...and lastly will the 3 wives do something to pualiana becos of uhmm..jelousy??? Im sorry for the questions in getting really scared thinking those things( ̄∇ ̄")

Ah yes, Lucius did have a child with one of the 3 wives. Honestly, it's his duty to have an heir so I guess that can't be avoided. She gave birth to a princess and then died. She's quite pitiful, she really wanted her child to be a boy because she knows how oppressed women are. Only there for marriage, men and childbirth. She's the one Pauliana is really close with and after she died Pauliana was very upset.
The princess inherited the throne though. Lucius changed the laws to better protect the rights of women. I love it.
I don't think there is a jealousy issue. I don't The 3 wives even like Lucius, they're just there due to family obligations.
Pauliana wasn't hurt, she doesn't love the Emperor at that time yet. What was important to her was her duty as a knight.
Pauliana and Lucius did end up together and have a son named Jared. He looks exactly like his father and has excellent swordsmanship skills.

The novel isn't translated. There's one chapter out but I really doubt that helps quell curiosity about the story.
I can give you the spoiler thread link though.
https://forum.novelupdates.com/threads/emperor-and-the-female-knight.99710/
Also, the webtoon is more on the fluffy side. The novel is REALLY dark on some parts. I advise caution when reading the spoilers.
Is it final, the manga will follow the novel?? If the manga turns out to be the same with the novel, emperor having three wives and shit. I think I'll have to stop reading sksksdj, here for rainbows and unicorns noT ANGST