So-yeon is an animal groomer who works in a pet shop. One day she gets stuck with a Persian cat named Silky when its owner suddenly dies. From that moment on, So-yeon is constantly haunted by a bob-haired girl with green, cat-like eyes who sends her life into disarray. So-yeon desperately seeks help from her friends and family, but no one will listen. The presence of the girl and the sound of Silky's cries start to terrify her more and more. On top of that, people around So-yeon begin to die one by one.
Soon, So-yeon comes face to face with the bob-haired girl at the scene of a horrific death. So-yeon gets rid of Silky hoping her troubles will come to an end, but Silky keeps coming back. Convinced that she could be the next to die, So-yeon sets out to discover the identity of this mysterious girl with the help of Jun-seok, her dead friend's ex-boyfriend.