Who are the seven fingers of the Old Nine Gates?

The Seven Fingers of the Old Nine Gates is a mysterious person with no name and no information about him. Seven fingers has no real name, only the code name of seven fingers, which has also appeared in tiger bone plum blossom. It was a man who plotted to destroy the Nine Doors. Tiger bones and plum blossoms say that seven fingers are used to find a long square to shrink the land. At the end of "Tiger Bone Plum Blossom", Grandpa Jiu gave a letter to the adjutant, asking him to give it to the Buddha, telling him to be careful with his seven fingers.

The origin of the seven fingers in Old Nine Gates;

This person only makes a brief introduction in the book, only knowing that he is a Zhang family member, with a high status and is proficient in metaphysics and organs. The man's age is a mystery. He lived for a long time. With seven fingers on his left hand, every generation of Zhang's leaders know his whereabouts and hide them in their hearts, and no one close to him can reveal them. He has a treasure, a bead that bloodthirsty absorbs the shadow of death. It's called Bi Fang Pass. Beads were placed in Yin Qi's tomb to absorb the dead Yin Qi. After eating, you need to take nine-door and eight-pulse blood gas every five years. Using the secret method of the Zhang family can prolong your life.