Se-young is the new girl in the office, and a fast target for her bullying supervisor, Lee-sun. With Lee-sun's harassment becoming a regular occurrence, Se-young finally snaps back with a threat one day. In this threat, however, Lee-sun senses a darker promise beyond the woman simply standing up for herself. Digging into Se-young's past, Lee-sun uncovers a sinister history of retribution, with misfortune befalling anyone who's ever crossed Se-Young's path. What wickedness could this woman really be hiding?