The secret of an ordinary man begins to show clues in his resignation. History professor John Oldman (David Lee Smith) said that he had a secret that everyone could not understand, and in order to keep this secret, he could not stay in one place for more than ten years. His friends tried to discover the secret in his story, which made John very angry, but his friends found that John's story could not be denied or verified. What kind of secret does John have? The fragments are connected one by one, bringing us an unexpected climax of the story.