[5] Mui began his career trading porcelain from the Ming dynasty and jewelry and importing and exporting furniture after moving to China.
While staying at the Peninsula Hong Kong, he met Benson Tung, a tailor at Ascot Chang.
Around 2004 to 2005 Mui took out mortgages on all three of his homes in order to launch his brand YellowMan, a high-end tattoo clothing line with the idea of "combining wearable art with Asian empowerment."
For his brand he traveled the world looking for the best tattoo artists he could find to make the designs for his clothing.
The shirts, adorned with tattoo designs ranging from Maori tribal to American traditional, have become what Mui calls "wearable art," and the number of artists he used grew to 75.
[6][7] Mui's tattoo clothing has been featured in top magazines,[8] including pictorials with model Lucia Dvorská in the 2009 Sports Illustrated Swimsuit Issue.
[2][4] In 1976, while exploring China, he met singer Teresa Carpio while she was performing at a night club and the two began dating.
[4][17][18] On August 18, 2009, at the age of 56 years old, Mui died after experiencing a heart failure.