Our Si Gung first taught Wing Chun at Jing Mo Gwun, a school in China. When the Communists took over China, he moved to Hong Kong where he continued to teach.

Many people think that Jiu Wan was Yip Man's student. In reality, he and Yip Man were kung fu brothers who both learned under Chan Wa Shun. Jiu Wan and Yip Man were very close friends and often visited one another until Jiu Wan's death.