The purpose of this paper is to investigate how Correspondence Theory of faithfulness deals with the Korean opacity case, ultimately claiming that the theory by itself can not provide an insightful account of Korean. This paper is to explore the issue of the opacity interaction of tensification and Consonant Cluster Simplificaition in the Kyeongsang dialect, originally raised as a problem for optimality-theoretical analyses by M-S. Shim (1996). Opacity necessarily includes the information about the character of the intermediate stage; therefore, ordering is crucial in arriving at surface forms. In spite of this argument, it is proposed that opacity problems can be accounted for with the parametric constraint schema, couched in Correspondence Theory of McCarthy (1995). As proposed by McCarthy (1995), the parametric constraint schema allows constraints to have conditions on the featural composition of segments, linear order, and adjacency. Correspondence Theory of faithfulness, which is based on the fundamental optimality-theoretic assumptions, can provide an account for opacity if the parametric constraint schema is adopted, independent of rule-based notions like counterfeeding and counterbleeding.