This study aims at accounting for suppletive allomorph selection in the Korean noun particle system using an Information Theoretic approach. Approaches that utilize phonological optimization fail to account for suppletive allomorph selection in Korean noun particles. It is likely that the phonological optimization seen in a subset of the noun particle system (i.e., Nominative, Topic, and Accusative, among others) may be a byproduct that has arisen in the minimization process of entropy or uncertainty in the Korean nominative particle system. The approach which is message-based draws an implication that optimal sound patterns do not exist for their own sake, but are the result of optimizing communication. (Sungshin Women’s University)