He Yuwei is reborn in a Republican-era courtyard house as the older sister of the cook He Yuzhu. Her military background and experience as a weapons designer make her stand out. Everyone in the courtyard is scheming: Qin Huairu plays the victim to seize the family assets, Xu Damao stirs up trouble and spreads rumors, and her younger brother is completely taken in. She has a fiery temper and throws punches at the slightest provocation, but no matter how tough she is, she can’t guard against underhanded attacks.
Then she unexpectedly acquires a golden finger: modern weapons blueprints appear in her mind, and she can exchange them for scarce supplies. She uses firearms principles to repair stoves and military engineering know-how to modify ovens. While everyone else is fixing their homes, she’s building blast walls, leaving the neighbors stunned.
She fiercely protects her own, smashing the door of anyone who dares lay a hand on her brother. Her sharp tongue leaves Xu Damao speechless, and when she puts on her uniform, the entire courtyard falls silent. Her mysterious husband makes an appearance, bringing a steady stream of resources with him.
Silly Zhu, who used to help Qin Huairu, is now a key technician at the factory. The widow who once pretended to be weak has been exposed and sent to clean the toilets. With the help of her System, He Yuwei takes control step by step, fighting her way from the courtyard to the military factory.
In the future, she will build domestically produced guns and cannons, become the military’s chief adviser, help her brother turn his life around, and keep her family safe. In the end, she will be the one calling the shots in this courtyard.
