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Soo-a seems to be a normal young woman, but one bad day she is kidnapped during broad daylight and in the middle of downtown. She is taken to a psychiatric hospital, locked up, getting drugs and is tortured. She doesn't know why all this is happening to her. To prevent herself from becoming insane, Soo-a secretly writes down the whole story in every detail. One year later, the TV-journalist Nam-soo receives a notebook. He also doesn't know why or who had sent him the device, but when takes a closer look, he finds the notes of Soo-a. First he thinks about a joke, but soon finds out that some details could be real, which leaves him shocked. He starts an investigation and soon finds Soo-a in prison; locked up as a murder suspect. Desperate to help her, Nam-soo wants to find out the truth of what happened to that young woman.

How to Watch Insane Legally and Safely

If you want to stream Insane 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 Insane 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.