Woo is part of a growing community of South Koreans who believe they are caught in the crossfire of two nuclear powers and are quietly preparing for the unthinkable.
For some in the audience, it was their first time seeing North Koreans.
Go Wan Hyuk showed "Nightline" a bunker designed to protect against "nuclear fallout and radiation" in case of disaster.
Musicians played K-pop, Mozart, Josh Groban and other popular hymns.
All Sources: New York Times ABC ABC