What if a Korean kingdom had successfully conquered all or a large part of China?
Were there any historical Korean states that could have pulled something like this off if given the right kind of opportunity?
Assuming it's possible, what would this hypothetical state look like?
Would it be sinophilic enough to establish itself as a Chinese rather than Korean state, or slowly be absorbed by Chinese culture until they did (like the Mongols, Jurchen, and Tangut)?