This report examines the trends in overall happiness scores over the past three years. The data reveals a persistent decline in scores, from 6.83 in the 20th year to 6.56 in the 21st year and 6.53 in the 22nd year. In addition to this overall trend, the research found that happiness in all areas - including subjective well-being and Eudemonia - has significantly decreased over the past three years. The gap in happiness between socio-economically vulnerable groups and others seems to be widening, suggesting an increase in happiness inequality. It is clear that further research and policy interventions are needed to enhance the average happiness of Koreans and narrow the happiness gap.