Yea, no way that could go wrong says the guy who clearly doesn't live in Seoul, South Korea with their family and all their assets within marching distance from over a million North Korean soldiers.
Are you speaking from personal experience? Are you genuinely afraid? I have been to North Korea and the idea that they are a serious threat to the southern part of the peninsula is laughable. They face not one, but two powerful armies on the same border. Their military is woefully out of date, and despite their pride, they do recognize that they don't stand much of a chance in a fight against the combined South Korean and US militaries. China does NOT have their back on almost any issue. The China-DPRK relationship looks a lot more like the US-Mexico relationship. They do collaborate on some things, but there is a lot of resentment, conflict over illegal immigration/smuggling, distrust, and dissatisfaction with the relationship on both sides.
North Korea's large standing army is quite misleading. North Korea is basically run like a large company with many departments and subsidiaries. The military is one of those departments, but a large amount of their work is not spent training for war, but building and maintaining infrastructure. They also pitch in on the farms. The military is loaned out to other government agencies whenever manpower is needed, which seems to be all the time. The bulk of the DPRK military resembles an unmechanized US Army Corp of Engineers more than a professional fighting force.
North Korea's aggressive attitude in international politics is a front to hide weakness. If you visit the country, you can see fairly quickly that their military doctrine and assets are set up like Japan in Spring 1945, not Japan of the early 1930s. The military is running the country, they will defend their country, possibly to the last man, if attacked, but launching an invasion themselves is just not on the table. The international diplomacy game that they play is similar to a cornered animal showing their teeth. They're scared of being invaded, and they don't want that. Cat's don't hiss when they are ready to pounce. They hiss when they want to be left alone.