a radar in preparation. >> reporter: at least one of north korea's musodan missiles has been spotted on the eastern korean coast, being fueled and ready to launch. it is powerful enough to travel more than 2,000 miles, putting u.s. bases in okinawa and guam within its reach. and they've had several missile tests before, but they have never tested the musodan. with something relatively untested like this, a concern is, even with if the target is intended to be the sea, if it fails, it could hit a town. that's the horror story because it's possible. >> even the smallest action could provoke a larger fight, a war or a significant military clash. >> reporter: a week ago in seoul. we found the people of south korea, while concerned, were living their lives. you have a long child. are you worried for your child's safety? >> not really. >> reporter: now it seems the mood has shifted.