Written by Jill Leung and Nick Cheuk, the film stars Louis Koo as a police inspector who travels to Pattaya to search for his teenage daughter and is aided by local detectives played by Tony Jaa and Wu Yue.

Along the way, he encounters the mastermind of an organ trafficking gang (Chris Collins) who colludes with a local political aide (Gordon Lam), leading to a series of hot pursuit.

There Lee receives assistance from local Chinese detective Chui Kit (Wu Yue) and his Thai colleague Tak (Tony Jaa) and also encounters American gangster Sacha (Chris Collins).

Clues connect the disappearance of Lee's daughter to a case involving the mayoral candidate of Pattaya's urgent need for a heart transplant.

Lee also suspects the mayoral candidate's assistant Cheng Hon-sau (Gordon Lam) of colluding with Sacha to abduct his daughter.

While suffering from the loss of his beloved daughter, Lee kidnaps corrupt officer Ban (Ken Lo) in order to get to the bottom of the case.

Police commissioner Chai (Vithaya Pansringarm), who is aware of the plot to save the mayoral candidate, tells Chui to drop the case, warning that a cover-up is already happening and that their own lives are already at risk.

Lee handcuffs Chui to the steering wheel of his vehicle to avoid interference and breaks into the sleeping mayoral candidate's room and listens to his daughter's heart.

Filming for Paradox began in Bangkok on 29 October 2016, where a filming commencement ceremony was held which was attended by producers Cheang Pou-soi and Paco Wong, director Wilson Yip, action director Sammo Hung and cast members Louis Koo, Gordon Lam, Tony Jaa, Wu Yue, Chris Collins and Ken Lo.

[14] Paradox received mostly positive reviews, with critics praising Louis Koo's performance and Sammo Hung's action choreography.

Edmund Lee of the South China Morning Post rated the film a score of 3.5/5 stars, praising Koo's physical and emotional performance, choreographer Sammo Hung's ferocious action scenes.

[15] Elizabeth Kerr of The Hollywood Reporter praised Hung's creative action choreography, writer Jill Leung's use of time to uncover the protagonist's indiscretions and cinematographer Kenneth Tse's use of colors.

[16] James Marsh of Screen Anarchy praised Hung's brutal action choreography, Koo's performance as having "gone above and above" and concludes his review by stating that the film "packs one hell of a punch".