Objectives This study was to examine the longitudinal relationship between grit and academic engagement using first, third, and fifth year data of KCYPS 2018 and to verify the difference in causality according to career decision making.
 Methods To this purpose, after reviewing descriptive statistics and correlation coefficients, the developmental tendency of grit and academic engagement and the causal relationship direction of the two variables were con-firmed through the verification of the autoregressive cross-lagged model, and used the test of the structural model invariance across the groups in the multi-group analysis was conducted to verify whether there is a differ-ence in the causal relationship direction between the two variables depending on the career decision making.
 Results First, it was confirmed that the level of grit and academic engagement remained stable for five years from the first year of middle school to the second year of high school. Second, while grit has a positive effect on aca-demic engagement, academic engagement has a negative effect on grit. Third, in the case of the career decision group, the level of grit and academic engagement was stable, grit had a positive effect on academic engagement, and academic engagement had a negative effect on grit. However, in the case of the career indecision group, only the level of academic engagement was stable, and there was no causal relationship between grit and academic engagement.
 Conclusions The developmental tendency of grit and academic engagement and the longitudinal causal relation-ship between the two variables were identified and the importance of career decision in adolescence was clarified.
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