Ten guests who received mysterious invitations were trapped in Moon Shadow Villa, which was closed by a snowstorm. On the first night, a secret room murder occurs; on the second night, a second body appears. Female forensic doctor Shen Nian found that her memory of key events was blank; criminal psychology professor Gu Yuan discovered that the "Shen Nian" he knew had died ten years ago. The murderer is around, but everyone could be someone else. When the snow stops on the tenth day, the survivors must answer: If memories can be tampered with and identities can be used falsely, then, who am I?
