Scary uncertainties regarding the Jeju disappearance cases

The scary reasons behind the disappearances in Jeju
1. A lot of Chinese thugs are coming to Jeju
2. 15 people have gone missing in the last 3 years and haven't been found
I really don't want to think this way, but these thoughts keep coming to mind
Whether they induced the cancellation of disappearance reports because they were too lazy to work,
or my worst suspicion: that those Yanbian beggars conspired with those corrupt cops and offered hundreds of millions of won to hush it up.
If Korean law is so weak that even if they get caught, it's just a pay cut or immunity—and if they can just go to jail and it's fine as long as they have hundreds of millions of won?
No, there would be constant public outcry, so it is extremely strange why they would produce such a result.