On the eve of the public archive's opening, the blue archive box on the central display stand suddenly disappears. Instead of assigning blame based on guesswork, Yan Cheng and Qi Yue verify step by step through access cards, surveillance footage, and witness routes, ultimately locating the original documents that Li Shuo had moved without authorization. Li Shuo confesses that he concealed what happened out of fear of exposing a filing error, and is willing to take responsibility. Together, everyone completes a two-person review, confirms the contents are intact, and fills in the missing procedures, allowing the exhibition to open on time. This incident teaches everyone that mistakes are not to be feared; only by communicating promptly, respecting the rules, speaking with evidence, and sharing responsibility together can trust and accountability be upheld.