4 Korean Stars 1 Wrong!

Can you find out which Korean Star does not belong to the other 3? - This game is a wonderful brain teaser. [Included Stars]EXO, EXO-K, EXO-M, A pink, Girls Day, BAP, 2NE1, Dal Shabet, 4 minute, Kara, ZE:A, Secret, Crayon Pop, Wonder Girls, Big Bang, SHINee, T-ara, Beast, Girls Generation, B1A4, 2PM, Super Junior, CN BLUE, f(x), Miss A, Infinite, Teen Top, U-Kiss, MBLAQ, FT Island, NUEST, Rainbow, 9 Muses, Spica, BTOB, 2AM, Busker Busker, Shinhwa, Epik High, KPOP Star, Super Star K, Infinite Challenge, Running man, Drama, Dorama, KPOP