Yu Chenghui (16 August 1939 – 4 July 2015), sometimes credited as Yue Sing-wai, was a Chinese actor, action director and martial artist.
For 14 years during the course of his martial arts career, Yu had been working on recreating the shuang shou jian (double-handed sword) movement, which was believed to be extinct since the Tang dynasty.
[1] In the wee hours of the morning of 15 September 1975, during a thunderstorm, Yu saw how a praying mantis reacted in response to the heavy downpour and conceived the ideas for completing the design of the swordplay technique.
Between 2001 and 2009, Yu worked with television series producer Zhang Jizhong on a number of projects, mostly in adaptations of Louis Cha's wuxia novels.
Yu stated in a 2005 newspaper interview that he never shaved his trademark beard, even at the request of movie producers, because he wanted to portray Zhou Tong, a famous Song dynasty military tutor, in a future film.