Responses
For me it was very annoying to see the trope where all the MLs keep bothering her despite the FL saying many times NO to all of them! These guys don't accept any boundaries or don't respect her wishes!
I like that FL always rebuffs the goldhaired scheming prince but everytime she rejects him he becomes more obsessed with her...
She is the beautiful Mary Sue with perfect hair and fair skin where all the guys easily falls in love with her.

https://huemi.wordpress.com/the-lady-wants-to-rest/
and despite liking the premise of the MC there are some complaints I have to make.
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MC is in a sense op but at the same time she is so restricted because of "The World Of Casualities" (High indescrible entity). I didn't understand why she is so restricted that she can't even use magic on her own commend... As the former king of Hostia she sacrificed herself for the Darkness of Destrucction a thousand years ago because she loves humanity despite knowing the malice, uglyness, greed, evil etc of the human world.
Blackhaired goldeneyed possesive ML The fourth prince/fiance is literally the chosen one given the mission to become an Emperor by the gods to stop the new darkness of destruction. He has conveniently the one special eye ability that makes him a very powerful king who can basically cut anything or mighty opponents. He is literally the only one who can free the FL from her curse. He is the only unaffected by the FL's curse where people forget when she reveals her true identity.
Obssesive stalking blond blueeyed psychotic Crown Prince 2nd ML nearly cause disasters or almost destroys the world to get this "fruit of truth" to rule the world because 1st Ml took everything from him. He wants to own FL no matter what because she is special/not like other girls.
3rd ML is initially a puppy deer wuss and the only son of the War Monarch Kainetel who killed MC/FL and her Crossaliance. He falls for FL because she defended him against bullies and she saves her enemy/murderer because of her bond with the son/3rd ML.
What bothers is the fact that MC/FL gets often saved/helped by these three unnatural lovestrucked princes. Fourth Prince + Crown Prince especially save her life twice. Their world suddenly revolves around FL Rubia who is a mysterious lovely mulitalented genius that make them very crazy about her.
So MC reforms the whole shit family because original Rubia wish was to be loved by them.
At the end she makes them all apologize to "her" after she taught them all a hardcore lesson and now they all have become a lovely more functional family...
MC/FL in Rubia's body is still in contact with them... Her demand is keep apologizing and loving me until I can really forgive you.... They are all messed up. The older brother cursed the father shit duke because of just simple greed.
That message doesn't sit me right at all.
I personally didn't like these aspects of the plot!
I lost interest reading the manwah because of these cliches + I realized how soapy dumb Reincarnation Fantasy Romance stories can be.