I think our lead's reasoning is a bit flawed. It seems like she already comes from a noble house, unless she's a poor noble which hasn't been stated, couldn't she live a comfortable life with her family? Her father doesn't seem to be pushing the marriage so its not like she's under compulsion either. Moreover, even if marrying the king gives her wealth and luxury that comes at the cost of having to deal with politics and essentially signing up for no romance for life. I mean we all know someone will fall for her, but from her perspective she's marrying a guy who says he won't love her and who she believes will get a lover shortly and I doubt she has the same freedom to pick another man lest she want to be executed. This seems like rather short sighted reasoning.