
So I looked it up, and this story is a novel adaption. But both stories have very little in common, so for once, me reading ahead does nothing. ╮( ̄▽ ̄)╭
For example, in the novel, Francis (the father) returns home shortly after the mother dies, and actually gets to meet and name Greta! She was abducted a few months later, when thieves break into the mansion.
Other differences are that Greta wasn't Number 5, she was Number 103 in the novel.
Also, Theodore (the brother) never bullies her in the novel, and Greta is told through the maids how hard Theodore worked to become Francis' successor (she hasn't even started taking fencing lessons yet; they're still "waiting on her health to improve" months later). Actually, so far Theodore functions as Francis' assistant in the novel, adjusting his schedule, urging him to actually do his job as Duke, and prying him off Greta when Francis inevitably starts spinning her around because of adorableness.
There are only 22 chapters in the novel so far (it's ongoing), and I got up to preparing for Greta's first tea party before giving up. (〜 ̄△ ̄)〜

So, I was curious about this story, so I hunted down the novel it's based on. It's interesting, but the FL's POV chapters aren't written in a linear fashion, so it's actually easier to follow the plot if you read the other characters' POVs. ╮( ̄▽ ̄)╭
I'm currently at chapter 107 of the current 631 chapters, and the older brother is my favorite, I hope he stays a POV all the way until the end. (づ ̄ ³ ̄)づ
Now, I just have to tell you why I love him, because there's no way that the manga will do it justice!
So, their mother (yes, she's their biological mother) is an abusive monster to the FL, and has been abusing her practically from birth. So the brother gets worried about her and learns healing magic from his father to keep her safe. Note that people usually learn combat magic first, because it's easier. Also, their father is at the top of the mage guild, so he's basically never home--he only comes home a day or two out of the month--but brother bothers his super-busy dad until he personally teaches his son healing magic.
This is important, because the day that the FL and the prince become engaged, she baits him into banishing her from the palace (so she won't have to attend princess lessons). When mom finds out, she literally tries to *kill the FL* with magic, and the brother barely manages to save her life with the healing magic he's barely learned (the mother fired the duchy's healer literally a week before, because he tried to stop her abusive behavior). The father ends up permanently sealing the mother's magic and put her on house arrest for a month, but the duchy basically swept everything under a rug.
The brother ends up getting control of the FL's education, because he knows that their mother will just use education as an excuse to hurt the FL, but of course the FL is an expert at running away, and he can never catch her. Then a little bit after that, their cousin Sienna is orphaned and gets adopted as their little sister, and the brother gets her educated, too.
Sienna gets jealous because the FL can just do what she wants, but Sienna has to study hard for anyone to look past her mother's common blood, which leads to her whole smear campaign against the FL. The brother ends up believing something Sienna said, and decides to punish the FL by banishing her to the annex. (The annex was a cabin his grandparents had built as a place to get away and relax, and brother and FL both vacationed there with his grandparents as small children). He meant it just to be for a day or two, but their mother and Sienna take advantage of the command and force the FL to stay there permanently, and just harrass her repeatedly where brother won't find out (the servants even gaslight him, claiming that FL returned to the mansion and is perfectly fine).
The year FL and Sienna are supposed to go to school, the brother buys them a carriage specifically for them to go to school together, but somehow Sienna is the only one who uses it and the FL has to walk to school. (The brother is the head of the student council, so again, he doesn't know, and Sienna lies constantly so he's too angry to seek the FL out.)
STILL, he's absolutely livid that the prince his sister's engaged to keeps trash talking her, and he repeatedly refuses to become the prince's future aide, because the prince is garbage in his eyes. The only reason he doesn't protest to the Actual Royal Family is because the FL talked to the teachers about how she doesn't care about being talked badly about so long as the abuse is only verbal, and she actually takes care of the prince and *his entire entourage* so their verbal abuse is treated as a joke.
The scene where the prince actually hurt her was actually worse in the novel, because there were students and at least three teachers (including the prince's homeroom teacher) watching, and the FL got permission from the TEACHER to go to the infirmary, not the prince. The teacher actually sat the prince down and spelled out what a horrible person he was, pointing out that he was following in the footsteps of the villainous princess (the FL's past life), and reported everything to the king and queen, and the queen was ABSOLUTELY LIVID. Which basically guilted the prince into *actually reading the reports* about the FL's behavior instead of blindly repeating everything Sienna said, and he actually confronts the brother over the FL's banishment to the annex. Meanwhile, the brother's like "What hut?? It's my grandparents' cabin, it's nice there?? What do you mean she's living there without any servants??" And the brother talks the prince into letting him read the report, too, and he's upset because everything Sienna told him was a lie.
Of course, brother talks to Sienna about the carriage, and she turns it into a whole drama to make the FL look bad in front of the entire student council and her entourage. (Note that he brought it up privately first, in the empty student council room, and was going to drop it when the student council members started to show up for their meeting, but Sienna saw an opportunity to look like a victim and went for it.)
Brother warns everyone about insulting a direct member of a ducal family and fiancée of a prince, and then goes to talk to the FL about literally everything, but she blows him off and he loses his temper and actually hits her. (I'm sorry, baby, physical abuse is hereditary, and your mother's a monster.) BUT unlike the prince, he immediately freaks out, picks her up and carries her to a chair and heals her and apologizes repeatedly, and immediately agrees to pay compensation, and repair the annex and personally enchant it with anti-theft wards. He even gives her a room on his floor of the mansion (where the heir stays), because it's a place full of people loyal to him so his mother can't use the servants to harrass her, and Senna won't be able to get in easily, and of course, her things won't get stolen.
And even then, brother is fully aware that he messed up, and his believing Sienna all this time has done serious damage to their relationship that will take him a long time to make up for.
But yeah, all that just happened in Part One of the novel, starting Part Two now and looking forward to all his POV chapters. ლ(´ڡ`ლ)

I read the novel on syosetu, which is the official site where the authors post it themselves. (Syosetu is like Ao3 in accessibility, except it's all original series, and these stories actually get published if they do well enough.)
So it's a Japanese site, but the MTL is perfectly understandable. The link is here: https://ncode.syosetu.com/n0481hq/

Okay, so it looks like the reason the mother hates the brother and the FL is partly because of who their father is. She was arranged to marry the future Duke of Robourg, and the oldest son and heir was Sienna's father, but he went and eloped with a commoner (which she considered a severe insult). So she had to marry the younger son, the FL's father. That's why she doesn't love the brother or the FL.
But the reason she hates the FL is because of who she resembles. The brother inherited his paternal grandfather's looks (which mom wanted), but the FL took after her paternal grandmother, who her maternal grandmother hated (which leads to her maternal grandmother and mother becoming estranged). So the FL "became the symbol of all her failures that prevented her from living a perfect life." And the grudge grew when her attacking the FL with magic got her magic sealed away.
Of course, Sienna ended up making that hatred worse with how she talked badly about the FL.
Also, the father isn't a bad guy. He just has no relationship with anyone in the family. I think I said before that he's the head of the magic division, so he has a lot of responsibilities and barely ever goes home. I think that if his brother never eloped, he wouldn't even have gotten married. He's a complete magic enthusiast.
Right now (as of Part Three), the only thing that's been revealed is the FL's relationship with the sacred beasts. Apparently, her father noticed a strong power emanating from the FL when she was still in the womb, and saw the fox sacred beast talking to her while the mother was sleeping. The father and the first prince also noticed that the FL kept her past life's baptismal name (it was revealed when she was making a contract with a newborn sacred beast) so they know, but they haven't talked about it yet.
Speaking of the FL's past life, apparently the King, Queen and the four Dukes are all aware that the "evil Queen" (FL's past life) wasn't actually evil. It reads like their predecessors might have been trying to protect her, but the FL says that someone (don't know who) betrayed her. No idea what actually happened there, though; I'm still just skimming alternate POVs and it's definitely info that would come up in the FL's POV.

Looks like the manga changed things from the novel, as per normal. But in the novel, Rogerio actually did reject dancing that last dance with Amy.
This is because in the novel, there were like twenty chapters about the party before the condemnation. Roge's little brother didn't appear: instead, a knight reported to Prince Ernest (it was the day after the condemnation that Will went to that same knight to confirm the details of his brother's transgressions).
And Princess Patricia went in person to confront Rogerio while Amy was dancing with another gentleman, and accused him of having an affair--which he denied. She then asked him if he was in love with Amy, which made him stop and question his feelings and actions, so he was ALREADY feeling like a heel before the condemnation. But he actually remembered that he was engaged to Lydia and shouldn't dance the Final Dance with anyone but his fiancée, so he rejected Amy and stood up against peer pressure from other partygoers who would have forced him to dance with Amy anyhow.
Lydia's fidelity was never questioned in the novel, this manga just made it up.
Note that Rogerio was still an idiot who deserves everything that comes to him, due to carelessness and poor judgement of character. This is just the one occasion where his character is made out to be worse than it is in text.

AND chapters 4 and 5 continue the trend of villainizing Rogerio.
In the novel, he didn't defend Amy during the condemnation, and he never claimed to be the victim. He knew he made a terrible mistake--one that he was prepared to spend his entire life making up for--and he accepted his punishment with dignity. Though he was super shocked that Amy, whom he actually did consider to be a little sister, was actually insane and picked fights with the royal family within five minutes of meeting them.
So just remember that in the novel, Rogerio was a clueless guy who took everyone at face value, but was actually a good guy at the bottom. He ruined his life because of carelessness, but he's not a villain, just an idiot.
Amy actually is this crazy, though. So at least they didn't change that. ╮( ̄▽ ̄)╭

I found the novel this webtoon was based on months ago, and seeing this adaptation being made, I had to read the novel again because I don't remember the father being this bad. ( ̄へ ̄)
And I was right! This adaptation made him (pointlessly) worse, because in the novel, he had bought out an entire toy store on a whim before he ordered the maids to replace Erusha's toys with the ones he bought. As opposed to the webtoon, where he just goes to her bedroom and immediately orders all the dolls to be burned...the webtoon turned him into a psycho. ┗( T﹏T )┛
Honestly curious what other details will be different between the novel and webtoon. ٩(๑❛ᴗ❛๑)۶

So I was curious and read the novel this manga was based on. It's pretty short, less than twenty chapters. So as far as character growth goes, Cheryl (the female lead) has barely started her healing journey by the time the novel closes.
Which means that the manga basically HAS to add scenes like the kitchen fire, because "My father is pushing matches as a business product to a ridiculous degree, despite its inherit dangers" only comes up as dialogue TWICE in the novel itself.
I don't know that I actually like the change, but as I said before, it's a short novel. They clearly had to do something. ╮( ̄▽ ̄)╭

Okay, if you're curious. I don't remember there being any "twist" about Sheryl being adopted, so we probably dodged that, and her family is just trash. (I mostly just remember being dumbfounded that MATCHES ended up being so important to the plot.)
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Anyways. Ending Spoilers, I guess.
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So the new matches are safely invented, and Hyland insists on the patent being placed under Sheryl's name. But her dad protests and tries to get the patent under HIS name, because of his match business. Sheryl doesn't know what to do about it, so they decide to do nothing for now.
The king invites Sheryl and Hyland to a party so he can meet "the Jewel Princess," and her family is also invited. Meryl and the mother protest to the king that Sheryl stole the king's letter and pretended to be Meryl to marry Hyland (which is treason), but Hyland brings in the old carriage driver as a witness to prove that the family were complicit in the crime. The family is horrified and tries to get out of the situation, and pretend that "the Jewel Princess" was Sheryl after all.
So the king gives the family a choice, asking if they sent Sheryl to marry Hyland (in spite of the royal order), or if they interrupted his party to lie to him (by bringing up this story and then saying that it wasn't true). Both choices would be considered treason and would be punishable by law.
Sheryl decides that now is a perfect time to ask her father what he planned to do by taking her patent for the new and improved matches, and he tells her that he doesn't intend to do anything with it--he just wants that patent to insure that the "safe" matches never get made and he can keep his monopoly. Which serves as a wakeup call to Sheryl, and she immediately disowns her family, because they never loved her.
And so the king punishes her family, but assures Sheryl that he won't blame her, because in his eyes, Sheryl really is "the Jewel Princess."

I usually have better luck with reincarnation stories, but from what I've read of the novel (about 50 chapters of the 150-chapter story) this is just an absurdist fantasy. It's not even a romance, it's just that the two main characters happen to be married.
Don't ask me what the plot is supposed to be: I think we're supposed to uncover the reason for why magical knowledge has decreased so drastically over the past 500 years. I don't know. ╮( ̄▽ ̄)╭

Yep, it's a Boring Invincible Hero story, where the author sets up stumbling blocks and the heroine solves it in two chapters or less.
The "good" guys worship the ground she stands on, and the "bad" guys are so ineffectual you wonder why they even show up. And the "deep, mysterious figure" they've been trying to introduce to the plot as a future main character is an actual weirdo.
It's legitimately like trying to read a 4-koma, every single chapter has a punchline. #-.-)

The translators say they're updating the character names to be faithful to the official names...and then they give us "Junta." HOW.
It's "Jeanne." The official translation is Jeanne, the anime uses "Jeanne," even the MTL for this name is "Jeanne." Gilbert (jirubēru) + Marianne (marian'nu) = Jeanne (jan'nu)
Stella is a little girl, they knew they were naming a little girl, why give a cute girl like Stella a Japanese boy's name. Translators, what are you doing??? ╥﹏╥

That hairdresser needs to be FIRED. Hairclip falling out of the FL's hair? Fine, it happens (especially if the clip breaks). The entire elaborately braided hairstyle falling out immediately afterwards? No way! Where are the other pins holding all that hair in place? Σ(  ̄□ ̄||)
Would have been better if the FL's hair was at least a little disheveled after that, but no. That would be asking for too much from the artist. Perfect default hairstyle it is, then. (〜 ̄△ ̄)〜
It's rare nowadays that completed novels get adapted into manga. I think the last three light novels I read have been on hiatus for a minimum of five months. ╥﹏╥
Spoilers for the ending below:
This novel is actually pretty cliché, with the FL going back to her old husband.
Apparently the ML has a cursed bloodline, where his family's magic turns them into a monster, causing them to be short-lived (traditionally the father dies before the son even reaches adulthood). The ML's dad didn't even tell his wife about the curse until after he died (it was in his will), and she did NOT take it well, basically losing her mind and taking drugs to forget everything. The ML hoped that she would get better soon, but he was busy taking over from his dad, and the war was starting up, so he was busy.
Naturally, since the ML was rarely home (because there was still a war going on: the war didn't end until literally JUST BEFORE the FL died) and his mom lost her mind, the servants took advantage and isolated the FL. The mother-in-law was jealous and seemed to think that the FL stole her place, and the servants were happy to abuse a foreign noble and have someone to pin their multiple thefts on. Seriously, they convinced the ML that the FL was a thief and a troublemaker and it was dangerous to let her near her own son, and since the FL and ML only interacted during their mandatory heir-making days, he didn't know that she was locked up and starved half the time. (╯°Д °)╯╧╧
He thought she was joking when he gave her that dagger, and was shocked when she used it right there in front if him and her five-year-old son. Which immediately led him to investigate what could have driven her that far, and then him purging the entire mansion (all of the servants died, and the mother-in-law was put in exile). He also found out that the reason the curse wasn't affecting him so strongly was because the FL was healing him every night they spent together, which obviously wasn't the case anymore after she died (making him feel guilty because of how he treated her).
Then he investigated the dagger, because it's supposed to be able to send someone back in time, and he was worried that the FL didn't have enough magic to go back in time, so he and his son (who was late teens at this point) decided to commit suicide together in hopes that their magic would be enough to send HER back in time.
Of course, when she returns to the world pre-war, her husband had his memories, too. So they're both running around in the past, trying to stop the war before it starts.
And yes, when the son is born again, he remembers his past life, too. (〜 ̄△ ̄)〜
I'm disgusted... Girl had a chance to go with the second prince or with anyone and swore not to go there again but she just walked here I hate japanese light novels they make the fl so disgusting
Fr!!! Like wow great idea to go straight back to your abuser, like you totally won't have fucking trauma just by seems them