Electronic pop duo PixelToy also contributed one song, who again appear with songwriting credits on Cheng's 2008 Mandarin album Spectacular Era (精彩年代).
Aside from a career in pop music, Cheng has starred in several films, including a special guest appearance in Stanley Kwan's 2005 feature, Everlasting Regret.
In August 2015, Cheng left Emperor Entertainment Group after 15 years, and has since focused on acting for mainland television dramas as well as developing her clothing label, "Why So Cool".
Cheng dominated the entertainment headlines in December 2006, due to a wardrobe mishap while performing an aerialist stunt for TVB's annual charity show.
The MC Eric Tsang later apologised due to public disapproval over a number of remarks made at the time of the incident, including a request for a replay of the accident in slow motion, though other MCs such as Nancy Sit and Lydia Shum were seen to have laughed uncontrollably in the television broadcast.
She again made news on 23 June 2007 while performing as a featured guest for New Talent Singing Awards Toronto Audition, where she exposed part of her bare chest.
When pressed by Stephen Chen in a 2008 TVB interview to comment on whether or not these incidents were staged, Cheng's manager, Mani Fok remarks: "Every woman has a bottom line.