This film is a horror film, but also a philosophical film, in which the simile is sexually transmitted diseases (STD). In fact, many times we always think that STD is very far away, and it seems impossible to appear around us, but in fact it is close at hand, just like the name of this film, it is behind, even around, around, like a shadow. People all say that to get this disease is to indulge in sexual desire and disorder. However, many people may just have normal interactions and live a normal life, but they contract this disease unintentionally. Perhaps what society really needs is not a doctor or a hospital, but a revolution in thought.
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