This movie has all the elements you expect from a historical film about an empire, a powerful emperor that is kind of ruthless, a rather blind follower of king that will turn agains him at some point , and the plotting for disthroning of the emperor...
I think if I was in the emperor's place with all the power and all the people obeying me without question and agreeing with me all the time I would do the same or even worse...
You can't expect from someone like an emperor to be calm and forgiving when is faced by betrayal of his love ,
This position requires selfishness and ruthlessness to some point, it's all to say that even tho his acts were wrong if he'd done any less it would be questionable for an emperor.
As for the chief I think he has never known any love and intimacy except from king so his inexperience and the queen's virginity just clashed together and primary lust escalated into love quickly (althou I think the chief fell in love the first time they had sex because he could have done it without any kiss but he chose to kiss the queen's neck )they could have been a happy couple in another world but in this world their love was bound to end in tragedy.
All in all I very much enjoyed this movie and my anxiety went throu roof towards end of the movie, definitely recommend everyone who is interested in this genre or not to watch it and the actor of the emperor absolutely rocked.