Do you guys think if NK attack US and if US wipe them out. Will SK invade NK land and become one country as K?

Lots of ‘ifs’ in their son.

If NK gets nuked then no one will be able to use the land fir at least 2 years so the chances of SK getting there hands on NK after any attack/conflict has been made then it can be a long process but it all depends on what NK does.

If N. Korea starts a war, it will end with the US and S. Korea invading and working to reunify the two countries, just as Germany reunified after the fall of the Berlin Wall.

Expect the process to take decades.

Remember North Koreans have no access to information the way we do. To them we are the devils and they truly hate us. This is not gonna be a cake walk