Gao Feng, the new supervisor at Dongyue Machinery Factory, deems the inspection position useless and abolishes veteran worker Sun Jianguo's post. Soon, equipment malfunctions one after another, yet he only looks at alarm data, pushing through production despite problems, which leads to a massive amount of substandard products being sealed off. Sun Jianguo steps in to stabilize the air compressor, check the oil pump, and clear up the fault sequence, helping the factory recover its losses. Eventually, the factory re-establishes a reliability team, combining experience with data to guard the bottom line of quality.