This series is pretty good in my opinion, but unfortunately it does seem to suffer from some of the typical shortcomings of harem works. The MC is a cynical government worker in a fantasy world, overworked and constantly saddled with the most annoying jobs. His work entails financial auditing and the destruction of entire noble families, often through straight up mu*der, if they're determined to be against the best interests of the Empire... Those work responsibilities go with the same job for some reason, idk it was explained at some point but I don't remember their excuse.
Anyway, all the important characters are very well-written, it's just... this is one of those novels where, if she's got two x chromosomes, has a name, and isn't already married, there's like a 99% chance she's going to fall for the MC, ignoring minor issues like her compatibility/chemistry with the MC or it making sense for the plot. Really, I can only think of one female character important enough to be given a name and not already married (as far as I know) that isn't crushing hard on the MC, and that's his childhood nanny/his mother's best friend.
Other than the excessive harem aspect, however, it's a pretty good read. For the most part, there's a sort of comedic undertone while our cynic MC is stuck babysitting a pack of foreign royalty that all have absolutely zero regard for the consequences of their actions, whenever he isn't playing errand boy/assassin for the crown prince of his own country. Then, every now and then, things take a turn for the serious and emotional, dealing with topics of loss and PTSD-like symptoms. These characters aren't 1-dimensional tropes with a single character trait and no thoughts given beyond that. They're fleshed out characters with multi-faceted personalities. Spoiler
The MC isn't just cynical because "lol exhausted office worker, end of thought". He's cynical because he's the sole survivor of a su*cide squad that put an end to the war his country was going through. One of the other members of that squad, btw, his fiancee actually survived the war but then took her own life afterwards.
The heroine of the original novel MC fell into doesn't form a reverse harem just because she's the dense heroine of a shojo novel that unintentionally pulls people in with her relentless positivity but fails to realize they're romantically attracted to her because the plot demands she have a smorgasbord of hunks pining for her affections. She unintentionally puts up a barrier around her heart, forming a series of shallow friendships but subconsciously fearing developing anything closer than that, because as a child, her sister that she loved resented her for monopolizing their parents attention to the point of committing su*cide.
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if you can look past the way that almost every character with a functioning set of ovaries is automatically head-over-heels for the MC, these characters have personalities and motivations that make sense for the lives they've lived. All-in-all, this is a good story, only slightly marred by the harem... to be clear, I don't hate harem stories in general, it's just that not every character in this harem really fits, whether it be their chemistry with MC or from a narrative standpoint.