Republic of Korea(ROK) sent the first group of Engineer forces on October, 1995 as a contingent of the United Nation Angola Verification Mission III(UNAVEM III) for Peacekeeping Operation(PKO) to Angola. Which was initiated by requesting of the UN on February, 1995. Dispatching to Angola is a unique case because it was decided during the period of aftereffect from dispatch to Somalia. And it was not the same engineer unit as others, which was to repair bridges and reconstruct in the area Angola. These facts stimulate this paper to be begun. What made the dispatch to Angola possible? To answer that questions is the goal of this study.
The Win-sets conception of two-levels game theory was used to study the decision making process of the unit's deployment and to investigate solution of discords between ROK and UN. The result of this study is that the security issue was the main factor of win-sets for ROK to negotiate, whereas, the mandates for UN was the main one. With the win-sets, the process of decision to send a Engineer PKO unit had to follow two-levels game including the possible agreement between ROK and UN, and the final ratification of ROK's National Assembly. And the discords about for mission area and the post was also solved on the base of the win-sets of them as well.