Desc: Si qi shi: Directed by Cheh Chang. With David Da-Wei Chiang, Lung Ti, Kuan Tai Chen, Chung Wang. This prime example of director/co-writer Chang Cheh's mastery takes place right after the Korean War, as a kung-fu master, combat instructor, explosives expert, and missle specialist heroically represent the Book of Revelation's four riders against murder, corruption, jealous and greed.