This study is aimed at exploring how competency-based educational experiences at high school and eudaimonic welling in adulthood affect subjective well-being. To achieve the objective of the study, we examined the data collected from the fourth to twelfth-round surveys of the 2005 cohort (from the first year of high school to the age of 28; 2008-2020) conducted by the Korean Educational Development Institute (KEDI) as part of the Korea Education Longitudinal Study. In specific, we leveraged the data from the fifth and sixth-round surveys (2nd and 3rd grade) focused on high school experiences and those from the nineth, tenth and twelfth-round surveys (when respondents are 22, 24, 28 years-old) focused on post-graduation experiences. For analysis, we carried out multiple regression analysis using the SPSS statistics program.
 Key findings can be identified as follows. First, competency-based educational experiences for self-management and social competency at high school had a positive effect on subjective well-being in adulthood. Second, the level of eudaimonic well-being with regard to self-acceptance, positive relations with others, and social contribution played a significant role in enhancing the level of subjective well-being. Third, autonomy and personal growth, two variables of eudaimonic well-being, contributed to improving the level of subjective well-being in the tenth and twelfth-round surveys, when the respondents were about to graduate from their colleges or seeking or having a job. As these variables are assumed to be related to career in adulthood, eudaimonic well-being with regard to autonomy and personal growth appears to be critical to enhance the quality of life at the time of college graduation.
 Put together, these findings suggest that the level of subjective well-being in adulthood can be enhanced when students develop their competency for self-management to go beyond education limited to cognitive achievement and make their own decisions for learning and career, thereby improving the level of autonomy and personal growth. Moreover, it is necessary to pay more attention to competency-based educational experiences for enhancing social competence. Emphasis should be put more on well-balanced and holistic educational experiences that help students build positive relations with others and contribute to future social development as a member of society.