In his past life, the male protagonist suffered a car accident and watched helplessly as his fiancée prioritized saving another man, while he perished in a sea of flames. Reborn back to the engagement banquet, he decisively tore up the marriage contract and refused to hand over the hard-earned housing to others. Losing his iron rice bowl, he relied on his top-tier locksmith/fitter skills, met a female factory director who appreciated him, broke through heavy suppression, and plunged into mechanical technology innovation. In contrast, the female protagonist and the man she valued suffered defeat after defeat in industry competition. Adhering to his original practical aspiration, the male protagonist conquered technical difficulties and step by step grew into a dominant industrial giant.