This chapter introduces the concept of Korean bullying and its characteristics. It starts with a brief history. Only recently has the issue been addressed by the South Korean academic community. In the beginning, although bullying phenomena existed, the term for it was unspecified. Research started using the term gipdan-ttadolim, meaning group isolation, but since 2001, it became broadly known as wang-ta. Still at relatively early stages of research, the studies are mainly focused on obtaining a broad, overall understanding of wang-ta in the South Korean context. Some empirical findings are reviewed, on prevalence, age differences, and gender differences. Characteristics of wang-ta are considered such as the number of aggressors, who bullies who, and varying levels of social isolation. There is a section on perceptions of bullying including the phenomenon of blaming the victim; and what pupils do, when they bully others, when they are victimized, and when they witness victimization. What pupils think about prevention is considered. A final section is on factors related to bullying involvement: individual, home environment, school and peer, and social and cultural factors; and their relative effects.