Developed countries are actively conducting various studies to support data-based policy design. Now, not only the government but also the National Assembly need to pursue legislative activities and policy development based on research evidence rather than political decisions. To address this need, it is necessary not only to accumulate high-quality data, but also to actively conduct in-depth data analysis by experts in the field. This research report is a joint analysis with more than 25 experts in the field from within and outside of the institute using data built through the survey on the Korean Happiness Survey and the Korean Future Values Survey, conducted in 2020. In addition to comprehensively analyzing various aspects related to happiness, including socioeconomic determinants, daily socialization, social capital, social environments, job circumstances, leisure, generation, and region, we also checked for problems with the surveyed data, and determined whether it is valid and reliable for researchers to use. In conclusion, we suggested policies and strategies to increase Koreans' happiness level and reduce the disparities between subgroups, based on a better understanding of the characteristics of Koreans' happiness.