When the city archives administrator {Lin Mo} was sorting through old files from 2008, he accidentally discovered an anomaly in the marginal notes of a missing case file, and awakened the ability to "archive decryption" - the ability to capture hidden clues that had been ignored in the files. This clue pointed to a "disappearance case of a painter" that had been covered in dust for 15 years. After she reported the discovery, the criminal police officer {Lu Zheng} who was responsible for re-investigating the old case came to her door. The two cooperated, Lin Mo dug out key evidence from the yellowed files, and Lu Zheng led the team to trace the real traces, but was threatened and obstructed by the person related to the case {Gao Jingming}. They broke through obstacles, made layers of reasoning, and finally revealed the real culprit behind the scenes. Lin Mo also became a special file consultant for the police. During the investigation process, the two also developed a tacit understanding and affection from their partners.
