After-sales engineer Shen Zhou is removed from a client acceptance check, but sales manager Luo Yi uses his prototype scheme to negotiate the order. Before leaving, Shen Zhou points out a locking defect, and client Tang Yue requests to stop the demonstration. After being accused of manufacturing a malfunction, he reproduces the failure step by step in the adjacent workshop, disassembles and revises the material causes, and admits that the old scheme still has shortcomings. Relying on objective tests, witness records, and a complete contribution chain, he fights for authorship correction and a pilot lead opportunity; in the end, the order can only proceed after rectification and re-testing. Counterattack relies on ability, team, and system realization.