This is the reason why i am a die-hard fan of maotsujun. i think that mao-chan's and jun-kun's perception of each other changed as they got to know each other and both became better people as a result of their meeting/relationship.
mao-chan didnt like bishonen (pretty boys) and especially didnt like jun-kun or his attitude, him being an idol and a Johnny at that. she was shy and very much kept to herself. jun-kun on the other hand, lived fully to his persona of a bad-boy idol and preferred older women. he assumed mao-chan would be like the other 'young' girls he met before.
but somehow, 'magic' happened. he was impressed i think by her 'i couldnt care less about who you are' attitude and became smitten with her. he learnt to respect her point of view and worked very hard to earn her respect. she also began seeing that there was more to him than his public image. it didnt come easy though, there was a lot of fighting and blood shed in the early days....but i suppose anything that is worth having is worth fighting for.
as a result of their relationship, he became mellow and more settled in himself, she became more confident in herself. hmmm, just got to love those two....who said that only first impressions count, ne?