Fong Sai-yuk (方世玉) was trained in the martial arts by his mother Miu Tsui-fa, daughter of Miu Hin, who according to the legend was one of the Five Elders, who escaped the destruction of the Shaolin Monastery by the Qing Dynasty.

According to legends, starting immediately after his birth, Miu Tsui-fa would intentionally break every bone and limb in Sai-yuk's body and then bathe him in the Chinese herbal liniment Dit Da Jow, making him practically invulnerable. This treatment gave Sai-yuk's body the quality known as "copper skin, metal bone".

While he was still in his early teens, he accepted an open challenge from Tiger Lui and killed him.

According to legend, Fong Sai-yuk was killed by Bak Mei (white eyebrow), the notorious kung fu warrior in a battle embedded with revenge. On the other hand, according to the history, Fong Sai-yuk was killed during the fight with Wu-Mei (五枚), which was at the event of "Shaolin fire", when the temple was burning down.