south korean's capital bracing itself to see if the unpredictable leader will carry out the threat of a missile launch. >> reporter: it's hard not to be worried, she says, but i doubt they will attack. south koreans are numb to the son lawsuit of threats, but also well practiced in living with them. monthly civil defense drills, where people in seoul practice citywide emergency evacuations. seoul is the city of 11 million people. one hour from the dmz. what all of the people know, if there is some sort of attack, they know to head underground. shelter, or the subways, which double as underground bunkers, seoul is a maze of underground concrete halls, but most residents don't believe they will ever have to use them. why south african native wayne seta isn't worried. hoping the talk even as loud as