It's a decent story. Would have been a great or superb story if it had no harem, but the harem is sooooooop annoying, almost all the time, so it drops the score by 2 stars. 
Like it's not even a unique or interesting harem either, and nor are the girls interesting. They are kind of cookie cutter and whatever personality they did have devolves into fighting the other girls and simping for the MC. 
4/5 stars for the story, but overall 2/5 stars cause the harem is really bad.

Terrible writing, inconsistent characters, author sucks at making things believable and forces things to happen that don't feel right or ate at odds with not only the characters themselves but the world setting. 
Honesty, even the trash op harem stories are written better since at least the trashy story is consistent with the characters and that world.
But this story isn't like that, and they just force things to happen.... just cause.
Like how can a top tier adventurer or mage get graped by some random slum dwellers even without a weapon? Or not even try to fight back? That terrible writing.
Or how can she have had a crush for her childhood friend for the longest time time and then Suddenly abandon him for the hero unless you wanted to must force ntr and grape without any real sense?
I've read literal hentai with better and more consistent writing than this trash.
This is an easy pass. Don't waste your time. Read hentai instead.

Just like your, I thought there was no way this could be 5 stars. But it deserves it . It's peak
 1. It's child raising. 
2. The child is an actual child not a reincarnator,.
3. Ita mega cute. 
4. The child is op, but it adds to the cuteness. 
5. She isn't a fully an over smart child, but she is equally childish enough to make her occasional moments of genius work well.

This one is a must read as far as child mc characters go, where the mc is an actual child.

Pretty terrible. MC is a villain that did terrible stuff, but pretends he didn't. 
And that was the fastest make me hate the MC in the first chapter I've ever had.
He's worse than the rapist MCs of trashy gooner bait manhua. At least they don't pretend to be good guys. This mc... fk him. 
Is this what Japanese teen boys like these days?

Fresh an interesting unique MC. I recommend so far.

Very mid. The premise and his restrictions in how he acts, doesn't actually offer anything new to the "villain reincarnation" genre that the others didn't already add.
And adding in a maso harem member isn't exactly anything new or interesting either (since its an ultra cliche archetype by this point).
There are much better ones out there, but if you are starving for villain reinarnation novels, you can give this one a go.
But the comedy falls short, the MC is... okay. The other characters are pretty cliche and boring. The only thing it has going for it, is its slightly overexagerated facial expressions as an attempt at comedy, without any actual comedy.
The story itself is also pretty uninspired either.

Summary: If this is your first villain reincarnation series, you might have fun. But if it isn't, you'll find yourself in a bore.

Sucks big time

Harem trash, and not the good kind either. Forgettable story, mc, and harem members. It's so cliche, that if you've read something similar before, you would not be entertained because it's probably worse than those.
If I had to give this a raring, it's about as bad as trashy Chinese Xian xia harem schlock. 
Do yourself a favor and skip this one. There are better harems out there with better story and characters. 
No, better yet, just go read some harem hentai instead. At least that will be more time efficient.

Mc sucks. The premise, while mildly interesting can't save terrible writing and bad characters.  The MC is basically an unlikable MC who literally only has power because of plot armor, and by himself, is just like the typical annoying side character in another series.
Easy skip. Bad writing, bad mc, bad side characters. This is on the same level as Chinese trash series.

Sucks big time

Its like fated villain, except worse in every way.
Why would you ever read this POS when Fated Villain exists.

MC wants to be low key. First thing he does is ra** his master (one of the leaders of his cultivation world). Very low key indead.

Skip this, and just re-read Fated Villain instead, unless you are looking for more trashy xian xia manga to read.

Read the novel, and I have to say, its pretty good. There's lots of character development for everyone from family to enemies, so you can see how they change as the story progresses.

It runs on comedic misunderstandings, but don't worry, there's no bullshit relationship drama misunderstandings where people don't talk to each other.

The MC is pretty likeable and you can see how she gradually develops into a more confident person.

This is a surprisingly good series for a chinese series. In the piles and piles of trash, you occasionally find an actual good series.

Good unique art style. Gripping storyline. Identifiable and colorful characters. Lots of suspense and thrills.

If I had to say, its like Dexter, but the MC is a female L, on the killer's side, and the shipping is actually possible.

The ML can be best described as Chaotic Good, and the FL is just cool as fu** with her smarts. I mean its almost like moriarty criminal consultant levels of smarts, if I had to make a comparison.