there’s something off with stella
Umm...right off the top of my head, Justice of a Villainous Woman...
http://www.mangago.zone/read-manga/the_justice_of_villainous_woman/
That was was really good to begin with, but the translation got kinda bad after a while. There have been others, but I'd have to try to find the names...and I have a bunch of saved mangas to try to look through.
Then this one, Miss Not-So Sidekick:
http://www.mangago.zone/read-manga/miss_not_so_sidekick/?nh0K
Tbh, I don't know if the original main character becomes a villain in this one. I only read the first few chapters and stopped because I prefer to read completed stories if possible.
There are others were the person reincarnates as a side character though...which are also good.
http://www.mangago.zone/read-manga/the_reason_why_raeliana_ended_up_at_the_duke_s_mansion/
http://www.mangago.zone/read-manga/i_stole_the_male_lead_s_first_night/
None of these are completed though, and I haven't read the whole of what's posted for the ones past like 10 - 15 chapter because I'm trying to be patient til they compete. There are a bunch of others, but I can't remember those titles. Hope this helps some. Sorry that it was such a long response.
if their laws are controlled by the church, then shouldn’t the emperor and the concubine be executed or something? because it’s infidelity and that’s against God’s word so.....
only if you think about it in christian ways...though it's called church in the story it doesn't mean they abide by the rules of christianity, it could be only the same term being used to a different thing. what i've seen so far is that concubines are allowed, not only in navier's country but on henley's too.
and that is, our fl is the ultimate heroine, just look at her personality, influence, beauty, aura, and so much more, they resemble the ultimate protag