the underground group was led by this man, adrian hong, a korean-mexican who held a u.s. green card. a yale dropout, hong became a human rights activist. >> adrian huang has said he considers himself a freedom fighter who's conducting a revolution. did you view yourself as a freedom fighter? >> no. no. i -- i -- obviously adrian has his motivations to doing what he wants to do. but my motivation was just simply to bring some hope to people who are hopeless. >> in the fall of 2018, christopher ahn was in italy when a cheollima team reportedly arranged for north korea's acting ambassador and his wife to walk out of their embassy in rome, jump into a waiting car, and speed away to freedom. in february of 2019, christopher ahn flew to spain for another secret operation. ahn says when he landed, he didn't know the details but suspected it had something to do with the north korean embassy in madrid. he went straight to the safe house, where he learned about the ambitious plan. cheollima was going to help the entire north korean embassy, an estimated ten people, defect. >> how w