Responses

The one who did not end up with the Emperor is the sister. She achieved her dream of being in a good marriage with someone she love. As for the FM and the ML, it seems that his sad past and the fact that he is not always a moron (he did not punish her when she had to put the concubine in her place because she was going to cause a war, even if he was close to) was enought to make their relationship better overtime.
I've done a reasearch on the novel:
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She didn't end up with the emperor and she successfully achieve her revenge and goal