This document summarizes research comparing causes of happiness in East and Southeast Asian societies. It hypothesizes that different country groups will have different levels of happiness and different mechanisms driving happiness. The results found that Southeast Asian countries were happier and more equal on average, while East Asian countries like Japan, South Korea, and Taiwan had more shared mechanisms influencing happiness like family, income, and employment. These common factors explained happiness more in East Asia, suggesting rewarding structures. Meanwhile, Southeast Asian countries had no shared mechanism and diverse influences on happiness, indicating potentially flatter structures. Therefore, country groups matter for understanding well-being, with East Asia resembling similar siblings and Southeast Asia resembling diverse friends.