both have the same atmosphere, though in Ouran we have hosts and in Mei-chan we have butlers. The comedy is pretty much the same, though Ouran is a little more on the comedy side, whereas Mei-chan is more romantic than Ouran. The girls in both dramas are orphans and a little awkward. They both have lovable characters.
A girl discovers that she has inherited not only a fortune but also a butler - thus she must enter an academy for fancy ladies.
It doesn't matter that one is Korean and the other Japanese, both of these dramas are about a butler and his mistress falling in love with each other, and having to deal with the people around them not being accepting of their relationship.