I have read many comments against ML but nothing is like that. This drama is wroth a shot. This drama shows that no matter what has happened in past you choose your future yourself. This drama is a example of two people going through same thing but choose different paths.
Leads has strong relationship. They understand each other without saying and has same mind while facing difficulties.
Princess has make me so annoyed in this drama. From my experience I know the person who is the sweetest is the evil, demon because of her I nearly drop the drama but did not because I wanted to see her end.
Both emperor are very kind hearted and value family and nation both which is rare to see in Chinese drama. They both have a very strong relationship with ML and they listen to him and respect his words.
This whole show shows that the change you want to bring to this world need to be started from yourself. FML set the new example for women and bring the change in her world.