I read this purely on a recommendation, albeit reluctantly. Normally, something like Unbalance X unbalance usually isn't really my thing, the main reason being that I do NOT like ecchi. As I read this I found myself cringing at the size of the breasts that all the females seem to have, so big in fact that they could practically knock themselves out with them.
However, once I overcame this problem, I found myself actually liking this story. The plot actually isn't bad, and is better than some shoujo and josei manga that I have read. the art work as well, once again, I had a bit of a problem with because of the ecchi elements, but barring that it was pretty good.
However, I have to admit that what really kept me reading this were the characters, particularly with Jin-hoo. I found his character particularly interesting because I wasn't sure what to make of his personality. In earlier volumes, his character seems to be a little selfish, niave, a little spoilt but overall decent. To my suprise, he turns out to be a quite the phsychopath with hints of a dark past, yet I found that inconsistency of his character interesting, Still, I can definately understand why it would frustrate other reviewers, not to mention his actions in later volumes are also cringe worthy as well.
I'll give this 7/10. minus 3 for the ecchi element, but a pretty good story overall.