The beautiful daughter of a duke, who has been "broken off" and "imprisoned", has her strongest magic book in hand and manipulates "personal connections, economy, and military power" to defeat the traitor. ! ! ! !
7 Volumes (Ongoing)

This series at first appeared to maybe be an interesting take on cliché premises. At first. It quickly turned into something of a train wreck.
The set up of the protagonist's initial struggle is illogical: after the betrayal of her fiancé and his entourage — predictably done while the king and his right-hand man are away — the only two people who could discipline the prince illogically threw her under the bus… for no apparent particular reason other than, perhaps, to spare an obviously horribly incompetent heir.
The effects on the protagonist are still somewhat sympathetic, yes. And the execution of her revenge is well thought out. However, that's where the good aspects of the revenge aspect end. At first it's subtle, but as the story progresses it quickly becomes clear that the titular "Livid Lady" went off the deep end after chapter one.
In chapter one, her position in the kingdom is mentioned as central to the continued function of their government. She could have easily gotten her revenge against all the actual perpetrators and collaborators (including those involved with the cover up) by simply leaving the country for its biggest close rival, selling them classified information, and moving her company there (to change the economic balance). That way, she'd get a slow-burn kind of revenge. Alternatively, she could have used brute force to kill those same individuals and then leave an effectively government-less country to its own devices.
However, not much later it becomes apparent that vengeance restricted to the actual people involved isn't good enough for her, she needs to take revenge on the citizenry too… for falling for a smear campaign …in a setting where information sources are very limited. And they're already suffering under mismanagement without her. Adding still more revenge is completely disproportionate.
The icing on the cake is that the characters are flat and the protagonist is yet another OP one. There's no real explanation for the rules of magic, "divine artefacts," or her particular "divine artefacts (?)" — it's all undefined and vague, even whether she has more than one artefact or a single artefact with multiple parts. And she uses it only sometimes, like those serialized works where the protagonist reveals some new ability every few chapters/episodes… never to use them again.
In short, there's numerous problems with this series, from the initial set up, to the characters, to the protagonist's abilities. However, the single biggest one is the revenge: it's overkill, there's no other word for it.
Plot: not typical villainess get's revenge. The plotline takes revenge to another level. The saying "tit for tat" is embodied in the plot with no mercy. There is no forgiveness. Unlike most stories, where the perpetrators are forgiven if they repent, the crimes are not taken lightly. lf you do wrong, no matter the reason, you will be punished. MC was abandoned by her ex-fiance Prince, her father, while the people of the kingdom for whom MC worked truly hard for did not trust her and rather betrayed her by believing in lies without question. Actions have consequences, and what they did would have led to MCs death. Her revenge is justified, methods are brutal.
Ps: the plot does not shy away from the reality of their lives, be it slavery or war crimes. It has a logical and realistic viewpoint.
Vol 1: betrayal and start of revenge.
Vol 2: financial growth for revenge finances.
Vol 3: border conflict, war
Vol 4: establish as an influencial merchant (ongoing, eng. ver.)
Characters: Over powered MC is brutal and calculative. She has a clear goal and focuses on achieving smaller feats to execute her revenge (bigger picture). Some of her revenge have collateral damage but I find that to be more realistic than a revenge plot where no one is harmed. Different side-characters in each volume, with different personalities and background. I think they will come together at the end of her final revenge. Side characters are well written but not discussed in detailed.
Art: amazing art. Well-drawn characters and neat backgrounds. The text is also arranged neatly. 9/10
Things I liked:
TW: gore, violence child death, r*pe, murder, war, slavery
pacing might feel rushed
PS: A lot of times, when I see MCs letting go of bandits because they are "doing this for their family", I always find it annoying, like 2 secs ago, they were about to r*pe and kill you and will do this to others too, but I love how this series shows no mercy to such characters.