>> what is bureau 121? >> they conduct the cyberattacks overseas and against enemy states, says this north korean defector, a former pyongyang military systems computer worker, now in south korea attempting to crumble an agency nearly impossible to chase, bureau 121, a shadow agency with an unknown number of the regime's hand-picked shadow agents placed in countries around the world. chung believes there are approximately 1800 of them. he says the agents themselves don't know how many exist. we can't verify chung's claims about the shadow group. but he says he's obtained from a current operative hundreds of financial files hacked from south korean banks, complete with names and other bank account details. is the cyberwar the real war for north korea? raising cyberagents is fairly cheap, he says, the world has the wrong view of the north korean state. with that incorrect world view,