Peak Villainess Story:

The story just makes you feel and understand the FL's constant struggles while also getting satisfying scenes so the whole manhwa isn't just pain and suffering.

To start things off the characters:
-Like I've stated before Penelope, the FL, is an excellent character and perfect for the villainess role. She's not a pushover and has a really cool and calm personality despite being someone who constantly suffers from the assholes around her. She's able to fight for herself and not only that but she's drop dead gorgeous. Literal queen type character.
-We have 5 male characters in this "harem" type manhwa. Though do not be mistaken not every man is romantically attracted to her. Two of the main male characters which have a strong focus on during this are her brother-in-laws. Because the original character is adopted as a replacement for a deceased girl she also just so happens to get neglected and face harsh treatment. So when we take Penelope's pov with the reincarnated person we are able to get a clear view of the kind of treatment she receives, especially from the two brothers. What makes the brothers really good characters is that they are realistically flawed. Throughout the story you can feel them slowly changing with their views towards the FL but at the same time keeping suspicions and past hatred. They don't immediately treat the FL like a goddess after one simple scene or sentence and there's a slow progression until the FL calls them out for their bullshit biased and uncalled for behavior. Those two scenes are the most satisfying ones in this entire manhwa and well worth the read for it.
-Moving on from the brothers though the more actual noteworthy characters have to be the father and the crown prince. With this most likely going to end up as a romance the crown prince is definitely the most favorable option. He has the typical "tyrant but actually not a bad person" type personality. He's a really cool character in general and also just not a complete dipshit for no reason. He has a snarky attitude adding on to his other colorful traits. The father who adopted Penelope is actually a great character in this manhwa mainly for the case of comedy and the "at least there's one person who doesn't treat the FL like utter garbage". He's a relaxing and chill character and he's obviously not the best person due to the backstory but at the very least he's a nice presence in the story.

Art:
The art is top tier not much else to say about that. It's one of my favorite art styles in all of manhwa and all the characters are beautiful and/or handsome as fuck. All the expressions are detailed as fuck and some of the scenes give goosebumps with the expressions and the art just makes the scene just so much better.

Story:
If you're looking mainly for romance this wouldn't be the best choice just because a lot of it is more focused on bettering relationships rather than romantic progress. FL spends a lot of time making sure the characters don't hate her enough to want to kill her. You definitely can see some romance progress made and obvious feelings shown from the male characters but if there is gonna be any real progress it will have to wait till later seasons.

However, otherwise the story itself is pretty fun to follow. She goes around from character to character and has a bunch of interesting interactions that lead to cute, sad, or hilarious moments. In moments of conflicts, it's always tense but nonetheless leads to satisfying endings with new sides of all the characters.

Overall:
This is a hella good reason and one of my if not my favorite villainess manhwas of all time. I highly recommend this for anyone wanting to read a villainess manhwa or any medieval time era type manhwa.