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Ma Dong is a retired criminal policeman due to injury. He was injured in an operation five years ago and lost part of his memory. The suspicion of his colleagues and comrades made him painful, but he could not explain it. He chose to leave the city. Five years later, by chance, he accepted the invitation of a girl he had helped and returned. After returning to the city, we opened a detective agency together and faced complicated cases together. While pursuing various truths, we also worked hard to find out the inside story of the year. Life has changed. How should Ma Dong face new challenges, new life, and new love? What new risks and new goals are waiting for him.