Asian horror movie

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Hi everybody, my first question here:

Watched a movie once that I loved, not sure if it was Japanese or Korean, it’s about supernatural deaths.

In the end we find out that they are happening due to radio frequencies or TV transmissions that opened up a pathway to evil spirits from another dimension. The survivors had to leave the cities and live in boats in the sea, far from civilization, where there was no radio waves.

Would love to see this movie again…

Thanks a lot!
-Claudio

Question is closed for new answers.
Chisco Selected answer as best Jul 23, 2022