두학의 여동생 정옥은 공장 노동운동에 깊이 빠져들고, 두학은 구사대로 활등하며 갈등을 빚는다. 검사가 된 철웅은 오만옥에게서 벗어나려 하지만, 만옥은 철웅의 프락치 전력을 다시 이용하려 든다. 엎친 데 덮친 격으로 정신의 납치소식까지 들려오는데!
Du-Hak's sister gets involved in a workers' protest. Du-Hak who was involved to clean up the problem was confused about what he should do. Cheol-Woong, who became a prosecutor, tries to get away from Oh Man-Ok, but Man-Ok tries to use Cheol-Woong's spy skills again. Even worse, they hear the news about Jung-Shin's kidnapping!
