While in Hong Kong, On was approached by
China Star founder
Charles Heung and filmmaker
Tsui Hark to take over the role of one of
Jet Li's film characters,
Black Mask, in
Black Mask 2: City of Masks (2002), despite having no martial arts or acting background. Tsui sent On to the
Shaolin Temple one month for training. He even received some guidance from Jet Li himself. Despite the poor reviews and the bad box office ratings, On continued to act, improving in both martial arts and acting. Like fellow Hong Kong film star Nicholas Tse, On trained in martial arts under Chung Chi Li, the leader of the Jackie Chan Stunt Team. On began training with Chan in 2001 for the film
Looking for Mister Perfect/Kei fung dik sau (2003), which was released two years later. On trained in
wushu at the
Shaolin Temple and studied film fighting under former
Jackie Chan Stunt Team leader Nicky Li for his first film,
Looking for Mister Perfect, which was shot before
Black Mask 2: City of Masks, but released one year later, in 2003. On continued his acting career with many injuries, sustaining a hamstring injury on the set of
New Police Story (2004) in one of the two fights against Jackie Chan. On was nominated and won the Hong Kong Film Award for Best New Actor Award for his role in
Star Runner/Siu nin a Fu (2003). He shared the screen with the man who influenced him,
Jackie Chan, in
New Police Story. On has also won the Best New Artist Award in 2004 at the Hong Kong Film Awards for his role as Tank Wong in
Siu nin a Fu, beating favorite
Vanness Wu by only one-tenth of the votes. Aside from his filmmaking career, On is also a singer. He has released some tracks, including a duet with Taiwanese pop singer
Jolin Tsai called "Angel of Love". His hobbies are martial arts and video games. He continues to train in
Wing Chun Kung Fu with good friend, actor, and martial artist
Philip Ng, and has studied
Thai boxing under former world kickboxing champion and actor
Billy Chau in preparation for
Star Runner. During production of the film
Three Kingdoms: Resurrection of the Dragon (2008), On was hit in the face by a stuntman during an action sequence. On cut his lip, and, after seven surgeries, sports a small scar on his lip. He considers the scar a "trophy" of his hard work in the film. ==Personal life==