By ELLEN KNICKMEYER and YONG JUN CHANG (AP) — The headlines on the newsstands in Seoul blared fresh warnings of a possible nuclear test by North Korea. Out on the sidewalks, 28-year-old office worker Lee Jae Sang already had an opinion about how to respond to North Korea's fast-growing capacity to lob nuclear bombs across borders and oceans. “Our country should also develop a nuclear program. And prepare