Yu Jin, a skilled technician at Hongguang Machinery Factory, can manually polish parts with an accuracy of 0.003 mm. She raises 500,000 for her terminally ill husband Liu Yundong’s liver cancer surgery, only to find him and his family transferring funds to buy a car for his younger sister. Meanwhile, the factory manager, Ai Dai, is obsessed with German equipment and dismisses Yu Jin. After being fired, Yu Jin is invited to join Tianxi Group as Chief Engineer, offering a seven-figure salary and a million-dollar relocation bonus. At the signing event, the parts Yu Jin manually polished meet the standards, helping Tianxi secure a $1 billion order from the U.S., while Hongguang loses the order and is on the verge of bankruptcy due to subpar samples. When Liu Yundong is diagnosed with terminal liver cancer, he regrets his actions and begs Yu Jin for help, but she rejects him. Yu Jin divorces Liu Yundong, fully freeing herself from his ungrateful family, achieving a career comeback and a new lease on life.