The current research seeks to illuminate whether parenting is the predominant source of the development of self-control, or whether teachers contribute to the development of self-control among Korean youths. The findings indicate that Korean adolescents whose parents monitor and/or teachers discipline them when they engage in deviant behaviors are more likely to report higher levels of self-control. Also, the results indicate that youths with low self-control are more likely to engage in delinquency. These findings provide partial support for the generality and applicability of the theory in explaining deviance among Korean youths. Taking a broad perspective, our findings, however, may raise a serious theoretical question about Gottfredson and Hirschi’s assertion that parental socialization is the only primary source of the development of self-control.