In Korea are there run down places like this?
In these places it is dangerous to be at night, you shouldn’t be out alone, you will get your stuff stolen if it is left unattended, most of the people are homeless and jobless, there is lots of crime and there is a good possibility they are growing marijuana in the backyard.

https://m.youtube.com/watch?v=nzH3p16NomU

See a translation

No.

There are much less homeless people in Korea than other countries. I'm 40. The first and the last time I saw homeless people was around early 1998 when the IMF crisis shook Korea. That was the last time I saw homeless people with my own eyes in Korea.

In my opinion, there is no particular place like "You shouldn't be out alone" in Korea. It's common for everyone to go out alone late at night in Korea. Wherever we live, we generally have no limitation about time when we go out. In addition, since the gap between the rich and the poor isn't that extreme in Korea and Korea is "relatively" safer from drug abuse than some countries in the West, we have much less homeless people than many other countries. So it'll be very hard to see homeless people wherever you go in Korea.

It's impossible to grow marijuana in Korea since it's strongly prohibited by the government who's concerned about the possibility to be connected to other drug use.

Pickpockets are rare. Almost no one in Korea is worried about their stuff being stolen.

There are no places like slums and ghettos all across the country as far as I know.