Greetings, Kim Jong-un.
I have no idea how you feel about your father, Kim Jong Il, passing away. You might be happy, sad, or indifferent. But I suppose one thing you definitely are now is scared. If things go as your father desired you are about to become the leader of North Korea. And therefore you've inherited one hell of a mess. At the very least you probably have to worry that you'll be promptly overthrown by whatever factions are competing with yours. Should you hang on to power you've got a country full of starving people, a backwards economy that pretty much exists at the whim of the Chinese, and various foreign powers that are just waiting for you to screw things up.
It's time to open the door. Let the world in. Sure, you'll probably want to do it slowly, But you have no choice. Your regime isn't going to last even as long as your dad's unless you save North Korea. And the only way to do that is to find a way to end its isolation. North Korea is far enough behind as it is, and it's only going to get worse. You've seen the outside world, you know what it's like. You can see what your people could have if they're allowed to. So give them the chance. Find some way to make a peaceful change, before everything comes crashing down.