How could they have NO suspects?
I do realize this is from the late 80s to the very early 90s and DNA testing was rare to get their hands on, but they interviewed over 3,000 suspects with several hundred thousand law enforcement officers all over South Korean and they could not even get close to this guy?
Makes me think about all the serial killers today who get away with what they do...I wonder what the real killer is doing right now? There's no way he could have just stopped killing, serial killers are not like that from what I know