Lu Chen is humiliated by his wife, Xu Man, over a pair of 65-yuan work shoes, bringing their nine-year marriage to a complete end. After their divorce, he is pushed out of engineering projects and fired, but he relies on his exceptional geological surveying and construction skills to establish Rock-Solid Engineering. He successively resolves a foundation emergency, exposes a scandal involving substandard steel reinforcement in a cross-river bridge project, and rescues trapped workers, while also drawing Xu Man into the investigation. Later, geological anomalies emerge again in the Yunling Tunnel, and a life-saving report is mysteriously deleted. A special-privilege account leads to new suspicions surrounding the engineering archives.