Someone Behind You

In Sung-Nam City, the teenager Ga-in Kim goes with her family and her boy-friend Hyung-Joong to the wedding of her aunt Ji-sun and she sees the bride falling off a balcony. Then she witnesses Jung-sun violently stabbing her sister Ji-sun in the hospital. In school, the outcast Sung-min tells her that the events were not accidents and advises her to not trust anyone, friends, and family, not even herself. Ga-in believes in a family curse and almost gets killed by the classmate Eun-kyung; then by her teacher; then by her mate in fencing. When her mother attempts to kill her, Ga-in becomes completely paranoid and travels to visit a strange with Sung-min to seek answers for the curse.