A track Chen dedicated to the people of Hong Kong in 2004, the same year he was assaulted in the city.
The segment also said "Regardless of the difficulty or chaos, the song is dedicated to HK: past, present, and future." In 2000, at the age of 20, Chen landed a record deal with Emperor Entertainment Group.
In 2006, he made his American debut as a Hong Kong journalist in The Grudge 2.
He was offered a small role in The Fast and the Furious: Tokyo Drift but he declined.
On 21 February 2008 he publicly announced that he intended to step away "indefinitely" from the Hong Kong entertainment industry due to the sex photo scandal in 2008, in which numerous photographs of his naked body and private parts, and those of several Hong Kong Chinese actresses, were published online.
He returned in 2010 but other than a brief cameo in the 2014 film Golden Chickensss, he did not make a complete comeback to the Hong Kong film industry until 2016.
It took him a number of successful album releases before he was given the opportunity to produce a hip hop album.
He also filmed a cameo as a thug in The Dark Knight but because of the scandal, his role was reduced and was seen very briefly as a receptionist instead.As early as 2001 Chen had appeared in Vancouver charity shows.He has also been a supporter for the gay and lesbian community in Hong Kong, including being voted as an icon in 2001.He is featured on M-Flo's album, Cosmicolor, on the track "LOVE ME, HATE THE GAME" with Chan, Thaitanium and Ryohei Yamamoto.After Chen's comeback in late 2009 he began work on his next album titled CONFUSION.He starred in many popular films including Infernal Affairs, Infernal Affairs II, Initial D, and Dog Bite Dog.Determined to expand his horizons to countries around the world, he also starred in the Japanese drama Under the Same Moon.Some reports states that he was originally cast to play Lau, a corrupted Chinese Accountant, which was played by Chin Han.He made his comeback in an Asian American film called Almost Perfect which he and his co-stars have been spending time promoting on several film festivals.Having made his debut in the Hong Kong music industry in 1999, he released a number of Cantopop and Mandopop albums under the record company Emperor Entertainment Group before finally making his first hip-hop album in Cantonese with the critically acclaimed 2004 release of Please Steal This Album.He followed this up with the 2005 Cantonese hip-hop album Hazy: The 144 Hour Project and the 2007 Mandarin hip-hop album Allow Me To Re-Introduce Myself.