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I found it already it was The villainess needs a Tyrant
I just googled "blond emperor manhwa tyrant" and scrolled until I recognized something
beta
MC is supposed to be the heir of a noble family but her uncle takes her title saying he gonna take care the "family" fast-forward a couple of years they plot for her death, I don't remember if she dies and comes back or if she just learns of his plans so she decides to just piss off her cousin by kissing the guy her cousin likes(the emperor) she kisses the emperor and he is interested in her audacious ways after all he has fame of killing easily
I think her hair was very blond almost white if not silver and the emperor is blond too but not as pale
There's a blue haired knight a purple haired minister or secretary a red haired female knight commander she dates the blue haired knight I think
It's complete and finished here on mangago