the train heading toward loose. but -- laos. but to get into china they had to cross the border on foot. >> it is a tough hike. >> we arrived at the embassy though gave us temporary passports to get to seoul. >> the whole family flew to south korea. the detectors knew life after a year and a half on the road to freedom had begun. >> when you arrive at international airport and step on south korean soil for the first time what was your thought? >> i gave a shout of joy. i could finally breet. >> it is worth it to see those who obtained freedom. >> coming up, technology is starting to crack open the hermit kingdom. i had enough of feeling embarrassed about my skin. [ designer ] enough of just covering up my moderate to severe plaque psoriasis. i decided enough is enough. ♪ [ spa lady ] i started enbrel. it's clinically proven to provide clearer skin.