>> that particular threat doesn't heighten the sense of danger, i feel, any more than just everything that's been occurring for the past couple of weeks. >> reporter: it has been a long couple of weeks, coming to a head now. south korea's capital bracing itself to see if the unpredictable leader in the north would carry out the threat of a missile launch. it's hard not to be worried, she says, but i doubt they'll attack. south koreans are numb to the onslaught of threats, but also well practiced in 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 these people know is if there's 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.