The polite and patient Operator-64 works at a business call center. He and his seven co-workers answer the caller's questions about job applications. Operator-64's routine is demanding, but he keeps his best disposition towards his colleagues. The man doesn't ask much from his life, just his job and his family waiting for him. But a sinister call turns Operator-64's life into hell when he tries to talk sense into the caller, but the latter confuses him. After the awkward talk, strange things happen. It's as if the devil possessed Operator-64's colleagues because they behave oddly, threatening what counts the most in his life. Will Operator-64 keep a clear head?