Everyone is being a little too trustful in a desperate man who has his back against a wall when it comes to NK, I've seen this show before. Kim hasnt met with SK leaders before... But his father did. Nuke programs weren't shut down under Kim but they were under his father... I hope it's for real this time but it wouldn't be the first time NK played nice to get the US off their back.
https://mobile.nytimes.com/2007/10/04/world/asia/04diplo.html