He is known for his work in various Hong Kong martial arts films such as Bruce Lee's Way of the Dragon, Jackie Chan's The Young Master and Angela Mao's Hapkido.
During a crucial time in the style's development, many of the prime movers in hapkido today, including Han Bong-soo, Kim Chong-sung and Myung Kwang-sik, were his seniors there.
[1] Hong Kong filmmaker Huang Feng brought Sammo Hung, Jackie Chan, Tang Wei-cheng, Hu Yin-yin, Angela Mao, Chang Yi and Chin Hsiang-lin to Seoul for a location shoot in 1972.
Impressed by the hapkido practitioners, Huang invited both Hwang and Ji to Hong Kong to develop a film idea inspired by the director's experiences in Korea.
He opened a dojang in one location and then moved shortly thereafter to the Greek area of Toronto known as the Danforth, where he still continues to teach and train on a daily basis.