In the Line of Duty 4 (1989)

Detective Ma Seok-do changes his affiliation from the Geumcheon Police Station to the Metropolitan Investigation Team, in order to eradicate Japanese gangsters who enter Korea to commit heinous crimes.

In the ultimate test of marriage, an agent-turned-househusband gets tangled in a perilous mission with his detective wife, who's clueless about his past.

Liu Yue Ping reports to the ICAC about a rich 2G Cao Yuen Yuen who bribed officers of the Hong Kong Correctional Services (HKCS) from inside the prison. William Luk decides to infiltrate the prison as an inmate to conduct his investigation, while his partner Ching Tak Ming and Chief Inspector Lau Po-keung back him up from the outside.

Follows a police officer who must retrieve an eyewitness and escort her after a cartel shooting leaves several DEA agents dead, but then he must decide who to trust when they discover that the attack was executed by American forces.

A celebrated cop, DCP Aditya, faces his toughest challenge when a taunting serial killer begins targeting victims and leaving notes meant for him. Teaming with an aspiring crime novelist, he must stop four more murders to save his medals, career, and reputation while uncovering the killer's past.

The Hong Kong police is hunting a counterfeiting gang led by a mastermind code-named "Painter" . The gang possesses exceptional counterfeiting skills which makes it difficult to distinguish the authenticity of its counterfeit currency. The scope of their criminal activities extends globally and greatly attracts the attention of the police. In order to crack the true identity of "Painter", the police recruits a painter named Lee Man to assist in solving the case.

Tough Chinese detectives go on a mission to Moscow to hunt down ruthless robbers who have been plaguing the trans-Siberian railway with violence and chaos.

A young detective seeks the help of a discharged police officer, giving him the chance to reclaim his old life in exchange for solving a bank raid case.

Macau Police brings the tracking expert police officer out of retirement to help catch a dangerous group of professional thieves.

Following his defeat by Master Ip, Cheung Tin Chi tries to make a life with his young son in Hong Kong, waiting tables at a bar that caters to expats. But it's not long before the mix of foreigners, money, and triad leaders draw him once again to the fight.