A Feng Shui master once predicted the demise of the Qin State. Is it a conspiracy or unknown?

At the end of the Warring States Period, Qin was determined to unify the world. However, Duke Nan of Chu, a great Yin-Yang family, predicted that "Although Chu has three households, if Qin is destroyed, Chu will definitely die."

Because Qin and Chu were at war, King Chu Huai took the initiative to ask to be a hostage in Qin in order to prevent the lives of Chu people from being destroyed. The people of Chu admired him very much and were grateful to him. But King Huai of Chu eventually died in a foreign land, and even his bones were not allowed to be transported back for burial. Therefore, the people of Chu State hated the people of Qin State very much. Therefore, if Qin really unified the world, as long as one person resisted Qin, many Chu people would join the resistance.