Umm heck no it wouldn't. If the US packed up its bases do you honestly think China would allow a democracy to topple a communist country on its border? Also the only reason China hasn't conquered half of Asia by now is the fact the US is present. Missiles have been fired over Japan from NK and apparently from China. Chinese naval vessels have violated the sovereignty of several Asian countries. China's Government has opennly threatened multiple countries. Taiwan is only around today because the US armed them to the teeth and if they were invaded they wouldn't go out without a huge fight.

The scenerio if the US pulled fully out of South Korea, assuming other Nato countries did so as well. China would likely broker a peace deal in which the North and South would join. But that deal would involve massive concessions to the North, in the case that South Korea actually did invade North Korea. China would continue arming North Korean forces. The North already has enough missiles and artillery batteries to level Seoul in a day or so without even entering the south. Even with the South's advanced military the country would take massive casualties and if they actually invaded and made it to Pyongyang. Do you think China would actually allow the South to advance further?

Firstly the Northern Government would send refugees by the millions north into China. The fighting would be right on the border and threaten Chinese regional stability and interests. If South Korea actually appeared to be winning and pushing towards China and their was no US presence in South Korea. China would intervene for sure.

The only way China would ever consider not intervening in Korea if the South stormed the North is if the South wasn't a massive threat. Even with their economic ties China would not allow a communist ally to fall right on its border. Example look at Arab spring Tunisia fell then Egypt then Libya. If a communist ally like North Korea fell the victory of the democratic south could easily translate into a rebellion or instability in China. Not to mention the massive flow of refugees and the fact the fighting would engulf China's border. The US is the only possible reason they wouldn't intervene militarily.

Many are right China would likely start by trying to merge the North and South. But if the South a democracy appeared to be slaughtering the North a Communist Ally, they would not allow the fighting to get anywhere near their border unless the US was involved. If the US was involved China would likely demand a massive DMZ on the border I don't think they would attack the US. Then again if the US was involved China would likely press for an immediate cease fire and call on North Korea to make a peace agreement with the south.

Either way I doubt China would allow a communist ally on their border fall to a democracy!

Somebody should kill the whole Kim family and its most powerful followers, there's no other way to defuse the bomb, as when NK economy will totally sink, bringing its people to famine, and it will sooner than later, it will surely try something mad, desperate and catastrophic.

First of all, is it possible that the North would engage the South again? I think it may be possible for several reasons. First, if the North is so desperate to the point where they're about to collapse and they may see war as a way to gain something. And/or The North starts a military conflict with the South and tries to blame the South and USA.

The results of a new conflict between the North and South? First of all, despite North Korea's much larger army, the World would not let South Korea fall. South Korea would obviously win. However, I could not see an immediate unification of North and South Korea come out of it. I don't think it would at all benefit South Korea and I think that many South Koreans would rather not have a bunch of ex-Commies running across the boarder asking for handouts. Perhaps if a more economically stable regime were set up in the North, then a future unification may be possible.

There are several other possibilities. First, China could invade, occupy and annex North Korea themselves, ending both the Korean War and the (international) instability of the region once and for all. The second possibility is that the US, South Korea, China, Russia, and even Japan (if it's constitutionally viable for them to do so) can launch a joint invasion of the North and set up a new Government that's at least semi-democratic and pro-capitalist, although the new Government would most likely be pro-Chinese and pro-Russian more than anything. The country itself would probably be renamed as well. Then there's a third, more practical possibility. China may simply tell North Korea to stop and the North may very well comply and things will go back to as they have been since 1953.