your explanation makes complete sense, and i really do agree. 갈증 is my favorite song too, i wish it had made the album. that and then 아주 먼 옛날. but you are right, they are made to fun, crazy songs, not ballads. oh, by the way, i'm 23 (feb 84).
yes, i have heard evergreen, it is a great song. it seems like they've been everywhere but korea recently. which is weird, because suju has stayed in korea, but they won (over dbsk, rain, battle, and shinhwa) the asia artist of the year award at the beijing star awards last week. (hopefully this doesn't have anything to do with suju china and lsm breaking up suju as we know it, but i really shouldn't get started on that.. haha..) i think they were only in korea for a day and then left again - it was an anyband concert, but dbsk performed as well. there are lots of fancams on youtube.
i think ft island has the potential to make great music as well. they are so young and already so talented and have been through so much training... i'm excited to see what they can create as well. and you mentioned 박효신 who is also great!
what other groups do you like? i'm still looking for more groups to check out. in general i don't like pop, but i really don't like any of the korean rock groups i've heard... it's hard to explain what i don't like about it, though..