Cop on a Mission (2001)
Original title: 知法犯法
Cop on a Mission is a 2001 Chinese-language crime movie directed by Marco Mak Chi-Sin, with a running time of 1h 29m. It stars Daniel Wu, Eric Tsang Chi-Wai and Suki Kwan Sau-Mei.
Mike, a cop who is becoming increasingly frustrated with his tiresome job with little benefits, whilst the criminals live a life of luxury. He is offered a undercover job to infiltrate a Triad gang led by Boss Tin. Mike slowly becomes engrossed in this world and in Tin's wife.