[1] Originally intending to work behind the scenes as a songwriter and a producer, Cheng did odd jobs at his father (Director of EMI Asia)'s company EMI— which included doing backing vocalist for the likes of Alan Tam and Priscilla Chan — during summers as a youth.

The lessons were apparently effective, as producers started taking notice of Cheng's voice and he was signed to a recording contract soon thereafter.

[6] His father, Norman Cheng (鄭東漢), is the chairperson and CEO of EMI, and formerly of the Asia Pacific division of PolyGram and then Universal Music.

Ronald Cheng started his relationship with Charlene Choi, a Hong Kong singer and actress, in 2004, after starring as lovers in the film Hidden Heroes.

[7] In 2010, while Choi announced ending the relationship with Cheng, the press revealed that they had registered their marriage in Los Angeles, United States in 2006.