Retired plumber Zhou Jianguo holds a decade of warmth, voluntarily repairing pipelines for the neighborhood while always guarding the artisan's bottom line and principles of conduct. A sudden rainstorm arrives, and a neighbor's private alteration of pipelines triggers drainage twists and turns; relying on half a lifetime of professional experience, he protects himself well and also helps clarify the ins and outs. After moving to a riverside residence, old neighbors encounter a water leakage issue due to self-alteration of pipes and mistakenly attribute the cause to him. He and his daughter trace along the pipeline traces and solid evidence to clarify the beginning and end, finally gaining the peace of years and the mundane warmth as usual.