Maintenance worker Zhou Ye worked hard for 312 hours, but his salary was collected by a machine substitute identical to him! Even more absurdly, he was actually registered by the system as a substitute and nearly faced recycling. Upon investigating, he discovered that all 63 employees in the building were embroiled in a shift-replacement scandal, and even the temporary authorization signed when saving someone was secretly changed to a long-term one! Not only did the company take away his labor fruits, but they also wanted to use a high salary to make him withdraw the investigation. Facing layer upon layer of obstruction, Zhou Ye joined forces with former colleague He Lan, vowing to uncover the truth and win back his own identity and dignity!