Who is Zhou Yixian in the immortals?

In the novel, he is a fortune teller, but his granddaughter Xiao Huan has real fortune-telling ability, but he knows a lot of past events in the Jianghu, and Ding Xiao spilled a lot of pen and ink and foreshadowing when writing this man. As for whether he is a dark horse, we won't know until Zhu Xian 2 comes out. He acts as a novice guide in the game.