Lucid Dreams is an episodic film which the director recounts four of his own dreams: Don wants to repay his debt by arranging a fake wedding; Fan, a white collar, learns to let go of his ego after struggling with love and work; a writer named Tong reunites with her long-lost mother; a driving instructor, Chung, is inspired by four 'ghost ladies' and starts to believe again in his musical talent.

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.

Follows an investigator as he prevents a terrorist attack during a symposium held by Hong Kong's Independent Commission Against Corruption. He later finds it has links to human trafficking in Thailand.

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.

When a series of eerie murders erupts across Hong Kong, grizzled veteran Huang and his reckless younger partner Wang, are assigned to track down the killer.