Chen Zhaodi, a spider woman with outstanding skills, in order to help her younger sister Chen Xiaotang gather the betrothal gift for breaking off her engagement, is tempted by the 400-yuan daily wage offered by Lao Diao, the foreman of a rogue team, and leaves Lanjie's regular female worker team, which adheres to safety standards and pays a daily wage of 260 yuan. The rogue team cuts costs, uses aging ropes, and ignores the safety red lines of high-altitude operations. An accident occurs, and Chen Xiaotang suffers severe injuries from a high-altitude impact. Chen Zhaodi wakes up to reality, joins fellow workers to collect evidence and defend their rights. After the accident, she returns to the regular team, becomes a safety officer, and guards the safety bottom line of high-altitude operations with blood and tears lessons.