We are going to study the financial characteristics of the South Korean equity market to see how they differ from those of similar equity markets in the Asia-Pacific Region. The results may infer how the Korean market differs from other markets with respect to size and behavior of firms, market efficiency and predictability of returns. This is especially important due to the political and strategic positions of South Korea, which characterizes South Korea with respect to the huge dominating financial markets of China and Japan. A data analysis indicates that Korean firms differ in size and other characteristics and that these characteristics differ from the characteristics of firms in neighboring countries of the Pacific Basin region. We are going to study the influences of large- and small-sized firms on other firms in the Korean equity market. Furthermore, we will observe a variation in stock returns among Korean firms as influenced by their neighbors in the Pacific Basin region. We will limit our conclusions to the firms and exchanges studied and the time period covered. The purpose of the current research is to enable financial and economic analysts to better predict the behavior of firms listed on the equity markets as they relate to changes in the economy of their neighbors.