well, even so that the hero of the movie doesn't match the heroine, I think they are a good match to fit the storyline.
he is poor, and alone while she is rich and has everything a girl would possible want (in that world lol) and she falls in love with someone who is not too attractive or doesn't have a lot to give her, but his heart... So that is why I feel like they are a good couple for the title and storyline of the movie.
It's not that bad, though it is not the best ones out there.. I think mab sua lis can do a better job, because I feel like her acting in 'txij nkawm teev kua muag" or whatever, she was really good...