DBSK.. I love them the most.. and they are really well known band over the Asia.. Their concert are fabulous.. with their singing skill and dancing.. and of course with their handsome and pretty face.. love them so much especially Hero JaeJoong..
Super Junior DBSK Epik High FT Island Big Bang Xing TRAX SNSD SS501 thats all that comes to mind srrys
it has to be TVXQ~ although they are kindof quiet in korea right now since they are working on their japan activities, tehy are REALLY popular they were even marked in the guiness world records for having the largest fan database.(cassiopeia)
bands that come to mind: SNSD(girls generation)they're pretty popular wonder girls (equally popular as SNSD) brown eyed girls and i cant believe no one mentioned V.O.S , they got amazing voices well, theres my 2 cents
I can't speak for the people in Korea because i'm in Canada but in my opinon these are some of the bands i think are popular: Super Junior DBSG Big Bang Battle Wonder Girls (I recently got hooked onto so hot =p) SS501 Shinee Well some of them are my favourites as well such as suju, dbsg and battle.
For me the Top three are 1) Big Bang 2) Fly to the Sky 3) Shinhwa Dont really rate Wonder girls and SNSD, though they are very popular in Korea Catchy but annoying tunes e.g. Wonder girls - Tell me That was the most annoying song, my frd had that as a ring tone for some strange reason
personally i love SUPER JUNIOR the BEST =D SHINee is also really good =] they have great songs Big Bang =] DBSK is still very popular especially with their new album that was just released hate to admit it but wonder girls is also popular XD ss501 ? f.t island ? SNSD ? i dont really know much about them except for f.t islands hongki XD
Teens Band? then SNSD 9 group girl band avg age 19-20 Wonder girls 5 girl group band avg age 20 DBSK but they been in the media for awhile now SS501 5 group boy band Super junior
Big Bang (it's a must) FT Island Dong Bang Shin Ki (even I'm not really like them) Wonder Girls Clazziquai SS501