The study aims to investigate structural relationships among teenagers' peer attachment, self-control, academic stress, internet usage time, and cyber delinquency. The data source was the Korea Youth Panel Survey, and the responses from 920 teenagers in the 12th grade provided the study data. Structural equation modeling was used for the analysis. The results indicated that teenager self-control significantly affected the internet usage time. Also, peer attachment, self-control, academic stress, and internet usage significantly affected teenager cyber delinquency. The research results imply that the development of peer attachment and self-control is important to reduce cyber delinquency. [For the full proceedings, see ED562127.]