Darwin, a senior photographer who consistently uses a manual camera, is shocked to discover the appearance of a woman's shadow in every photo he takes. Soon, the woman's figure appears in real life, terrorizing him. Pia, Darwin's girlfriend, decides to investigate the woman's identity. It turns out the woman is Lilies, an outstanding student who once studied at their university. When Darwin's friends die one by one, Pia is convinced this is related to a 'sin' Darwin committed in the past.