Both Trump and Kim have big egos but completely different personality types, and relations with the people around them. Can you honestly not see a difference in the personality and methodology of Donald Trump and Kim Jong Un?
What is happening is, Kim has never had to submit to a more powerful person, such as an actual authority figure. the law, a judge, etc etc. In HIS universe, HE is God. His answer to problems is to have someone executed or send them to prison camps until they are vegetables. All the people suffering in his country are suffering for HIM because it is their purpose for existence. They have no more value than the individual cheese crackers he guzzles for his pleasure.
Trump has given Kim Jung Un specific ultimatums and Kim is not able to play him, threaten him, or kill him. In fact, Kim is in a tght spot for the first time in his entire reality. To Trump, he cannot and will not back down until he gets what he wants—which is essential for the safety of the world, but America foremost.
Kim Jung Un was making his usual threats when Trump withdrew.
The deal being worked out is, Kim realizes for the first time that he and his world can be utterly annihilated. And he needs some kind of assurance that the military exercizes the U.S. is engaged with South Korea is not a threat to his empire (him ultimately).if he gives up the nukes.
I ultimately DO believe this will work out as scheduled.
If you really understood Trump and Kim and how they are different, you might actually find it intriguing as to how things will play out.