True crime but drama related after all so many of them were inspired by Hwaseong serial murders.
The killer was identified but statue of limitation already passed unfortunately:
http://www.koreaherald.com/view.php?ud=20190918000889

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    At least he’s currently in jail.

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    Makes me want to watch Signal again. I’m glad they’ve finally found a suspect, but the whole statute of limitations thing is unfortunate.

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      It must be awful for the families to know that he’ll never face any legal consequences for that murders, good that amended that law, shame that it took so long.

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