What is The Secret Behind, the king of Qin in the ghost blowing lamp?

This is not the mirror of the king of Qin at all, but a copper railing that can be regarded as Sunday gossip. After collecting four eyeless symbols, we can deduce the secret of coffin mountain.

Coffin Mountain is a tomb built by Feng Shigu, the Taibao of Guanshan Mountain, hoping to become immortal through the tomb. His descendant Feng (that is, Professor Sun) had to get four eyeless symbols and copper railings to enter the coffin mountain. The copper rail fell into the hands of a Frenchman (that is, a multi-spiritual father) in the turmoil. Later, the French went to sea and drowned, and the copper railing sank with the ship. When Feng learned of this, he deliberately made up a set of lies, saying that the copper railing was the mirror of the king of Qin, and asked his friend and professor to come forward and entrust him to go out to sea to retrieve it, which led to the plot of the book "The South China Sea Returns to the City".

Feng said, "You can't look at the back of Qin Wang's bone mirror" because the back of the copper railing is an image of gossip on Sunday. He was afraid of being seen by Hu Bayi and others, so he lied to them. In fact, the mirror of the king of Qin has long since ceased to exist.