At the age of 16, Fung was introduced by friends to Hong Kong composer Chan Kwong-wing.

In the year 2000, she joined Chan's newly founded studio, Click Music.

She also worked as a backing singer and demo singer for various artists, and as a vocal producer for movies including the Infernal Affairs trilogy, Initial D, Daisy, The Warlords, and several DreamWorks animations.

Fung also sang "Shining Friends", the theme song of TVB television series "Hearts of Fencing" and "Find your love", the theme song of the series sequel "Sunshine Heartbeat".

Another song written and sung by her, "Forever Friends", was also included in the album "True Colors".