The poster’s family is the Yang family of Hongnong. The ancestor is Shuyu, the younger brother of King Cheng of Zhou Dynasty. He is a prominent family in Shanxi.

The Yang family of Hongnong has produced many famous people in history, including the four generations of three princes Yang Zhen, Yang Biao, Yang Ci, and Yang Bing in the Han Dynasty, the three prime ministers Yang Siyuan, Yang Zaisi, and Yang Guozhong in the Tang Dynasty, the famous general Yang Jiye in the Song Dynasty, and the famous general Yang Jiye in the Ming Dynasty. Yang Yiqing, the governor of Shaanxi and the trilateral commander-in-chief, Yang Bangzuo, a cabinet scholar, and of course, Concubine Yang.

The name of Sizhitang comes from Yang Zhen’s famous saying when he faced bribery from his student Wang Mi: "Heaven knows, earth knows, and I know. What is ignorance?"