1. If you dont want OP characters then be prepared. (This is not the most brain daamaging part btw.) First, our FL is an assassin in her previous life so technically she knew how to kill she's ruthless. She transmigrated to another world where she's close to dying with her bones in the leg broken. In the span of 5 years, her skill and ability 'rose drastically' to the point where it enables her to assume many identities. She's the 'greatest of all' so even if she's brutal and fake sometimes, they all still hover around her like fools.
2. Almost every pursuer of FL, fell in love at her in their first meeting. Hell, she just sang songs from the modern era and people just had hearts in their pupils like wtf. Even the ML was victimized in her performance.
3. We're in messed up part. I'll elaborate it you guys can't stop me. Even if the idea was subtle it was still uncomfortable when you think of it.

1. They got together first (real fast. I'll just blame cupid for this) being lovey dovey and all, then things go awry and they became SIBLINGS. Naturally, they hesitated but they throw the resistance away and still continued being husband and wife behind the scenes while being siblings in public. It turned out that it was false because the ML was adopted by MC's parents but STILL!!! It's fvcking horrifying for me who's against incest.
2. There is a guy who's been in love with our MC. He became the EMPEROR of their kingdom. Technically he didn't conceive any children to inherit the throne (like what? He killed his brother's whole family, and technically the only one left after he purged those who is against his rule, for the FL and now he can't even produce a legitimate inheritor of his family's lineage?) but here's the catch... FL had a second child, a daughter and yes. He saw FL's shadow in the child and eventually grew fond of her while the child had a crush on him. They END UP TOGETHER. Wft?!!! Kid, he's good enough to your father just WHYY?!!! Even if the author put some hesitation in the guy's mind it still won't change the truth that he will marry the child of FL whom he used to love. I'm not a devotee nor desperate to understand the unreasonable side of that LOVE and no matter how I look it's messed up.
3. There's this one villain who had weird sense of having pleasure. He likes abusing/raping his wife, he gets excited at the thought of touching his sister (the 'sister' is wearing a mask that intends to copy the real sister) and he touches males.
4. Also, the emperor, the father of that abusive bastard, was also incest. He likes his half sister to the point of obsession and did many crazy stuffs that make the MCs lives difficult.

4. Villain's ending are all bloody and miserable that they were pitiful.

abusive husbands/gang r*pe/anal/incestuous r*pe to death/suicide, as if because they are so evil, they deserve severe domestic violence/sexual torture. Several girls have brains crazed by hate and jealousy, and they end up gang/incestuous/an*l r*ped by crazy Imperial men/bandits, and it was just unnecessary and graphic.

fake-incest relationships in the middle of the story. Fake, because although one brother didn't actually touch his sister, he was insane and used substitutes. Another couple found out that they might be siblings (but they weren't). One brother found out his sister was someone else pretending with a face mask, so he... while the mask was on. And there was an adoptive brother who developed insane possessive feelings towards his adoptive sister.

the world's number 1 doctor, fashion designer, jewelry designer, poison master, martial artist female

Yes, she is transmigrated. The story starts with her being exiled (kind of... anyway she was forbid to go home for a certain period) by her family. She lived at some kinda countryside and cultivate there without anyone knowing because like other story everyone thought she was a tr*sh and wasn't able to cultivate.

Anyway, this story SKIPPED, yes, skipped about her cultivation and jumps straight to the end of period when she was supposed to be exiled and need to go home. At that time she had cultivated to the point of becoming OP so she decided to go home because you know, to get revenge for the original owner of the body.

Well, she already OP so killing them is an easy task but it won't be fun to just kill them so we gotta do it from inside. Attack when they least expected. She returned home and keep pretending as an idiot. The rest is up for you to read.

So it starts out introducing the MC who has already transmigrated and integrated herself in this world for what, 4, 5 years (and has become really OP in that time period) who returns to her 'home' (which, personally, I think is s*upid, because obviously she can live pretty well off on her own--she literally doesn't have to care about a bunch of people who don't want her there) only to find her fiance (I remember it was some prince) decided to break off the engagement and then she got engaged to ML...

SO, moving on, MC gets some admirers, ML gets some admirers, and a lot of cliche stuff happens ie. people trying to kill the MC to get the ML, the ex-fiance regretting breaking off the engagement, some business agreement with the prince of another country, said prince liking the MC, ML getting jealous... (okay, I admit I don't remember much of what happens in between)

Later on, MC finds out that she is 'blood related' to the ML and panics because it's incest and she knows it's wrong but she still loves him and all that, and then she is relieved when ML when he says that he's actually adopted by her parents and that they have no blood relation but they decide to keep mum about it because his real identity is real sensitive and should not be revealed.

Fast forward through a lot of details that I don't remember, MC finds out that oh, she's not the only one who's transmigrated. Apparently, the person who singlehandedly caused her death in her previous life is also here (and the young master of some Peng Lai? island or something) is out to find her because he loves her and wants to be with her even after she refused him and stuff.

After all that drama, the MC is pregnant and the gu (a type of poison) in the ML is transferred to the fetus and the MC and ML try to get rid of it through a series of trials in some tribe. Seriously?

The ending is happy...I think.

Almost no fight scenes while the MC have poison and martial art, she hardly uses them.

Even their children were perfect. Duh!

In the latest chapters, after the whole "hey, let's stomp on the people that were bad to her before she took over the body" arc, you would think that the whole marriage would go better as she now achieved the condition, but it doesn't even try and shows us that not only were the parents of the husband not dead in the way everyone thought, the king obviously had a hand in it and is not sane at all and probably the one that poisoned the husband.

You might think that it could make for a good story to have good opponents, but so far all of the people that wanted to hurt our main character were not sane people, and it's always "someone wants to hurt her, so she will hurt or even kill them in return".