This study aims to examine 'The Warm Glow Effect' in Korea. Thus, this study looks at whether participation in 'NANUM' behavior (giving and volunteering), which are called routine altruistic behavior, can increase Life satisfaction. This study used data from the '2019 Social Survey', which was investigated and provided by Statistics Korea, and analyzed using a Propensity Score Matching (PSM). The study showed that participating in giving and volunteering led to improved life satisfaction for citizens in both the ATT(average treatment effect for the treated), ATC(average treatment effect for the control), and ATE(average treatment effect). These results mean the existence of the 'Warm Glow Effect' in Korea, which shows that citizens can increase their life satisfaction through altruistic behavior. This study is meaningful because it has examined the effect of altruism and altruistic behavior, which are noted as the key to overcoming unprecedented national disasters and solving various social problems, based on the theoretical framework. It is also meaningful because it provides valuable clues to enhance 'NANUM' in citizens' lives.

Key words: Altruism, NANUM, Life Satisfaction, Propensity Score Matching