Siheyuan: My name is Cao Xing, and I have a strong background

++Cao Xing traveled back to that fiery era. Cao Xing changed the situation of material shortage and backward technology with his own efforts. In his spare time, he treated the beasts in the courtyard to add some color to life. Yi Zhonghai went from being a moral god to a hypocrite who was hated by everyone. Liu Haizhong became helpless in his old age. Jia Zhangshi became a dead spirit. Bang Geng was half dead. Yan Bugui: Fortunately, I didn't offend this kid, otherwise he would laugh and kill people! Things in the courtyard are just the spice of life, and the world outside the courtyard is more exciting. Cao Xing seems to be present in every major event. As a passionate young man, the dream of a strong motherland is his heart. There are many bad things and beasts in the courtyard, don't mess with them...