Further reading >> http://en.wikipedia.org/wiki/IU_%28singer%29
I met her the first time when I watched Dream High, a musical Korean drama. I completely fell in love with her and the character she acted out, it was awesome and lovely. Then I went to check her songs. I like her singles in general, like Good Day and the latest You & I.
I've just heard today that her fans are (unofficially) called "Mellow" or "Mallow". I think it should be "Mallow", though, as it's strange calling yourself "Mellow" in this context. :P