Alenira

A "polygamous marriage" with three handsome princes! What's more, if she falls in love with any one of them, the nation faces destruction!

First of.. she hasnt played the 3 princes.. its the head of state that invited all tre and told her later.
Secondly they are all there trying to win her over and all arived / noticed eachother.. the blue haired even askes her if she rejected him because one of the other two got to her first.. and she says no.

So all 3 princes know of eachother being there hence they each know they are compeating to get her.. so how is she in the worng..

Third.. its the minister that accepted all 3 marriage wishes.. and tell her "to save the nation, she must now marry all 3 and keept it hidden from them"..
Dude.. she said no to one, lets meet another time to another and that she would like to have tea with thw third.. yet you say she "played them" and now has to play them all because if she ever comes to love one of them "destruction"..

Is she a living sacrifice for the ppl? Where is the rest of the royal family.. and why is an incompitent minister guiding her..

So the sister is the spoiled princess of the family that is jealous that her older sister is "trusted" with the future and marriage of the family.. And the fiance is a prick who finds Fl "plain" because she dosn't dress up, act on emotions and is in general a well manerd and well taught lady.

He gets with the sister, breaks the engagement and gets her "engaged" to the monster duke... hoping that she will break character and cry / beg him to chose her.

Yet FL choses to fufill her duty asigned by her father.
Im guessing she just wants away from that shitty family that treated her like a workhorse just because she was born with white hair..
They used the exuse that she was the oldest to force her to work for the family, while denying her needs because she "should not act/ be spoiled because Duties".