The great love of the FL was the worst criminal and murderer. This is how the story starts. He stabbed FL because of her rival and cut out her heart. O yes, where love goes!

And her later husband ML is left with what was left after FL's rebirth, a laboriously constructed implausible love story. A little lovey-dovey and all is well. Chemistry? Hardly! And, whoops, she almost had sex with his alter ego in the cave. After all, she'd known him for a few hours.

But ML clings to love even after FL leaves him rather arbitrarily. In fact, she betrayed ML significantly more seriously with her past.

And her final revenge against the 3rd prince in episode II/16 is poor. Is that what all the fuss is about? His atrocious crimes like cut out heart, murders etc. are held up to him in a tired speech, a little reproach and complaining, and she herself is done and dusted.
ML then becomes emperor. Why can't FL, as his wife-consort, go to the palace with him?
Lots of authors messy crap.