The purpose of this study was to examine the relationship among variables by setting up a regression model in which Korean narcissism affects avant - garde aggressiveness through emotional expression ambivalence. For this purpose, 327 adults in their 20s were surveyed using scales to measure each variable. The results of the study are as follows. First, as a result of correlation analysis, covert narcissism had a significant positive correlation with ambivalence over emotional expressiveness and displaced aggression. Second, as a result of regression analysis, ambivalence over emotional expressiveness was found to mediate the relationship between inner self and avant - garde aggression. As a result, it was confirmed that emotional expression affinity plays a major mediating role in the relationship between covert narcissism and avarice aggressiveness of early adolescents, thus suggesting the importance of evaluation and intervention. In addition, it was discussed that how appropriate emotional expressions can play an important role to prevent potential attack of the emotions that had been suppressed.