What challenges would a unified Korea faced, after 50 years of complete seclusion on the Northern side?

Based on the documentary on North Korea: http://www.vice.com/video/vice-guide-to-north-korea-1-of-3 [see part 2 & 3 for complete documentary] … Prepare an argument based on the following premise: What if the N. Korean regime was to collapse, and the two Koreas were to unite as Western and Eastern Germany did? What would be the political, social, and economic repercussions? What challenges would a unified Korea faced, after 50 years of complete seclusion on the Northern side? Your discussion must be thorough and analtical. Minimum of 3