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After barely surviving a violent attack by an elusive serial killer, crime boss Jang Dong-su (Don Lee) finds himself forming an unlikely partnership with local detective Jung Tae-seok (Kim Moo Yul) to catch the sadistic killer simply known as "K".

How to Watch The Gangster, the Cop, the Devil Legally and Safely

If you want to stream The Gangster, the Cop, the Devil through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry The Gangster, the Cop, the Devil films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.