Surprise invasion, KPA (North Korean Army) using what was then modern Soviet equipment pushed down to pussan through an under prepared ROK (South Korean Army) where literally the majority of the forces defending the border were on weekend leave and those that did fight had obsolete WW2 infantry equipment to fight against tanks and automatic rifles. The US forces present in Korea at the time were little more than occupation troops meant to support police.
So, it is true that North Korean forces made it nearly to Pussan on the south coast, they immediately fell apart once the momentum was lost and US reinforcement arrived from Japan and abroad. After that Chinese forces did much of the fighting when UN forces nearly got to the river that forms the border between China and Korea.
Terminator Genesys. It’s loathed by terminator fans for a variety of reasons and I won’t defend any of the writing or casting decisions, but I do give it credit for trying to do something new with the story and time aspect. I think it could have been a lot better if they took a bit more time with it and recast a few characters, but overall it’s a popcorn flik to me, turn your brain off and enjoy.