Who is the white-haired old man in Xiake Island?

Pity the old man. Chivalrous Island is an isolated island in Jin Yong's martial arts novel Chivalrous Journey, which is located in the South China Sea and four days' voyage from the mainland. The white-haired old man on Chivalrous Island in the novel is actually a compassionate old man, the owner of Chivalrous Island, and also a famous Wulin geek. Before he died, he presented a set of martial arts cheats to the protagonist Shi Tian Tou.