This episode's headline: Power Struggle; Unanswered Questions; Weighty Discovery; Forgotten War. The guests include JEREMY ROSNER, Carnegie Endowment; RICHARD HAASS, Council on Foreign Relations; FRANK COLLINS, Researcher; KIM YOUNG SAM, President, Republic of Korea; PRESIDENT CLINTON; CORRESPONDENTS: NIK GOWING; JEFFREY KAYE; KWAME HOLMAN; BETTY ANN BOWSER;. Byline: In New York: ROBERT MAC NEIL; In Washington: JAMES LEHRER