They are the best group in Korea since 1998. They sing & dance very well. They sing very well at live shows too - it is especially evident when you watch their concert dvds. They have already released 9 albums and many others (winter story, summer story, osts ...)
I just love these guys. A fun loving group with members that love each other (as if they were real blood bros). Its the way they love each other that makes them more attractive than any other group in Korea. Their close bonds are very evident in their interactions & the way they rally around when one member is in trouble / sick.