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Former serial killer Byung-su gets diagnosed with Alzheimer's. The doctor tells him that it's due to the aftereffects from a traffic accident 17 years ago; the same accident that stopped him from his killings and allowed him to live a normal life with his dear daughter. So when a series of murders occurs near his town, Byung-su gets worried whether the killings are his doing during his memory lapses. But then he comes across Tae-ju and instinctively realizes that he is the serial killer. He reports this to the police, only to learn that Tae-ju is one. Byung-su tries to find firm evidence that Tae-ju is a psychopath, but only raises Tae-ju's interest in him and his daughter. And now with his memory slipping, Byung-su must find a way to protect his daughter from Tae-ju.

How to Watch Memoir of a Murderer Legally and Safely

If you want to stream Memoir of a Murderer 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 Memoir of a Murderer 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.