One of the best Hong Kong movie of Y2K era. Well pace, good story, good actors. Operation Undercover led by Miu Kiu Wai is to recruit police and have 1000 of them sent to become undercover to remove the triads. Miu used to be one for 7 years. The primary gang is led by Yue Hua and runs by capable men like Eric Tsang, Francis Ng, Jordan Chan, Julian Cheung. Not long into the story have one small member been nab by the cops. Eric send a killer Shawn Yue to kill the undercover Timmy Hung. The gang soon face troubles from the police as the pressure mounts. Julian's activities were busted and he consulted Eric for help. Eric told him it is better for him to run and he will take care of his business and mum. Francis who has some shares shared with him also face problems like all his money been freeze by authority. Eric keep trying to unite all of them together to stay strong. He later met Sonija Kwok at a shop and slowly likes her. Julian didn't run away. He went to find Jordan to tell his plan of working together to overthrow Eric and Francis. Eric wants Shawn to run away but that attempt was tip off by Julian to Miu. Eric find Miu personally and reveal to him he has a witness and know during his days of undercover, he rob a bank and killed a cop. He want to use this as a bargain chip. The big boss holds a meeting and wants everyone to write down their choice of scapegoat. He now knows Eric is the trustworthy among them and even though he is good worker, he must send him to his doom first if trouble arise. Julian saw Francis child in the pub and gave him a poison drug. The next day he tries to escape, Francis kills him in front of his mum. Eric decide to reveal his love to Sonija but Shawn is gonna kill him as he thought Eric tip off. The part is quite sad for Eric as he bought roses and almost made it but still can't escape death. Francis surrenders to Miu and it turns out he is also undercover. Soon the whole gang was smash. Francis jailed for 5 years and the big boss 20 years. Francis upon release will be the new leader of the gang recommended by the big boss. When Francis decides to quit been undercover, the new cop leader force him to continue after release or else his wife and children will be deport back from Australia. Miu also confess the cop killing to another superior.