Maintenance worker Jiang Yang senses through experience that the C-3 machine tool spindle bearing has worn down to its limit and submits a 1,800 yuan replacement request, only to have workshop director Ma Jianjun cross it out and reject it under the pretext of cost reduction and efficiency improvement. Jiang Yang quietly puts away the approval form and records audio as evidence. Three days later in the early morning hours, the spindle snaps and the production line is paralyzed, causing a daily loss of 2.3 million. Ma Jianjun shifts the blame on the spot, but Jiang Yang produces irrefutable evidence to get him dismissed and held accountable. Entrusted with the critical mission, Jiang Yang forms a rush-repair team, invites a reclusive veteran master, cracks the military-grade encoder, and exposes the conspiracy of financial director Li Bapi in buying off a mole to deliberately sabotage the spindle, bringing the imported machine tool back to life in just half a month.