Hold the Space in Your Hand, Single-Handedly Defend the Country's Borders

I want to read a book similar to "The Age: Killing Through the Siheyuan and Traveling to the Great Northern Wilderness at the Beginning". At the beginning of the founding of the People's Republic of China, the male protagonist was injured in the Korean War and transferred to Forty-Nine City. He had a conflict with his brothers in the courtyard. Many people were seriously injured and sent to the frontier for construction. While guarding the border, he encountered future civilizations and acquired technology.