Korean alternative pop?

[SiEd]

I was just wondering if Korea had any pop groups that 1) have lasted for a decade or two, and 2) have constantly reinvented themselves in terms of genre and style. (I'm going to assume here that such a group will not be that popular, but will have a strong base of loyal fans.) What I'm thinking of is a Korean version of "Sparks", basically.

[holdfast]

i don't know of any bands that are that old and still together..... usually the mandatory military service puts a hindrance on that...

if there is a group like that, taliana might know.