UdayVeer brought up in royals have gone to best institution for studies and got whatever he needed whereas Moniya who was kidnapped at the age of three have lived her life traveling from one place to another due to which she couldn't complete her education. UdayVeer probably has loads of outfits, shoes, watches so on in his wardrobe which he can choose from to wear whereas Moniya has just two pair of clothes that she wears. While one is north pole the other is south pole. Their way of living life has been completely different from one another.
UdayVeer and Moniya/Manyata have royal blood flowing in their veins. They can kill each other by their words and not to forget the attitude these two stubborn people give to each other. UdayVeer might have grey shades to his character but he has reasons behind it. We could see the goodness behind the attitude Prince during his conversation with his sister and Dadisa.
What happens when these two contrast yet similar people cross path-FIREWORKS!! The charmer whom girls can't stop starring/praising the plain jane is not affected by his charms. Which makes you think what will be charmer reaction when he founds Miss.Mirchi is Rajkumari Manyata and plain jane's reaction when she finds out her marriage has been fixed with Mr.Pohochi Huyi Cheese. Only time will answer this question.
EDITED-Anju's take and after discussing with Pocu a detailed analysis on Uday and reading her wonderful post I have done some changes to the original post and title.