Earlier quoted context omitted.
China has plenty of rural areas anyway, and NK population is 2% of Chinese population. China is pretty much the only country that can pour enough money into NK to bring it out of poverty, and a border with an important US Ally (South Korea) would be priceless. I don't think that's what they want to do, but it would actually make sense.
China has historically tolerated NK because it doesn't want to share a border with a US ally. China intervened in the Korean War precisely because the UN forces came too far north, in spite of China warning them to stay clear.
At this point it's in China's actual interest to resolve the situation. They'd probably like to resolve the situation with with the stick poker intact but that doesn't appear to be acceptable anymore. I'm guessing they are hoping Kim cools it down just enough and they can wait it out until the political climate in the US changes and then business as usual.