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Cheung Bo (Zhang Bao), known as Dai Ngao Bo (Big Bull Bo) although almost a decade younger, was one of Yuen Kay-San's close friends. Cheung worked as a chef at Tien Hoi, a local restaurant next to Kuaizi Jie (Chopstick Street). A large and powerful man, he taught Wing Chun kuen to a small group of fellow staff members including Sum Nung at night when the establishment was closed.
Cheung Bo learned his Wing Chun from Nationalist army doctor Wai Yuk-Sang (Wai Yusheng), who studied under Fung Siu-Ching's pupil Ngao Shi (Ou Shi).
Cheung Bo was renowned for his fighting skills, which he reportedly used to keep even the raucous young martial artists who frequented the restaurant in line, and for his talent with the gold-coin darts.
Title: Sum Nung was a student of Sum