
I've done a reasearch on the novel:
*S P O I L E R S*
.
.
.
.
.
.
.
.
.
She didn't end up with the emperor and she successfully achieve her revenge and goal

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 REALLY FUCKING HATE HIM. AND THE UKE IS STARTING TO DISAPPOINT ME
(︶︿︶)=凸