I think many readers of this manhwa agree that the ending is unacceptable.
The MC is a PERFECT guy/prince just turn into a CHARISMATIC lady/princess, good story and I understand as an author, your job is to torture your readers with tension. The fun of fiction is anticipation, and if your story doesn't have it your readers won't stick around but i feel like the author is rushing it a bit.

This manhwa is not the usual common romance clichés, it has a twist, it's kind of realistic story where "you can't always be with the person you want" and to be with the person who doesn't think about you and not letting him go instead agreeing to tie the knot with him knowing he'll love another person for the rest of his life, how stupid, those kind of relationships always end in ruin, I cant help but feel sorry for MC's best friend he deserves at least to know the truth about the MC's true feelings and her secret.