"I'm a bully who somehow ended up becoming a loner."

Moonbyul was a bully at MuMu High School, and ended up being sent to a schoolyard because she bullied other kids. However, the schoolyard was in the countryside, and the kids there didn't recognize Moonbyul, who was famous in Seoul, and when they saw her quietly, they thought she was a loner. The story begins with Moonbyul's school life after she became a loner.