A woman lives for absolute revenge against her childhood bullies who destroyed her life.

In her high-school days, Moon Dong Eun dreamed of becoming an architect. However, after suffering a brutally violent attack from her bullies, she is forced to drop out of school. Years later, one of the bullies gets married and has a child who attends the elementary school where Moon Dong Eun now teaches. After years of plotting, Moon Don Eun begins her plan of revenge against her former bullies--and the students who stood by and let the attack happen.