Princess Channing's mansion is called a ghost house by the world. Why?

Kangxi gave Princess Channing to Wu Yingxiong, the son of Wu Sangui. After marriage, Wu Sangui's anti-Qing dynasty brought trouble to his son and grandson, which led to the execution of Wu Yingxiong and his eldest son, Wu Shilin, and Princess Channing became a widow and could only live alone, so the origin of the haunted house came into being.