Faced with severe occupational injuries among workers at a contract manufacturing factory and the desperate threat of foreign clients withdrawing their orders and demanding compensation, ergonomist Han Jin steps forward, determined to completely overhaul the outdated assembly line. However, the old factory director, accustomed to squeezing every second of labor out of his workers, fiercely resists the changes, while the strict zero-budget restriction makes the renovation even more difficult. With the factory inspection deadline rapidly approaching, Han Jin relies on precise motion analysis to overcome one obstacle after another. He is determined to use scientific human-centered design to protect workers' health and give the factory, now on the brink of collapse, a chance to survive.