One aspect of the Imjin War, marked Japanese superiority in land combat and Korean superiority in naval combat, reminds me a bit of ancient wars in the classical era, Athens vs. Sparta in the Peloponnesian War, Rome versus Carthage in the Punic Wars.
What if, as in those wars, both sides took more elaborate counter-moves. For instance, could the Koreans have had any success using superior naval gunnery and mobility to transport a superior force to seize and hold Tsushima island from the Japanese, or to devastate any of the Japanese ports of debarkation or Japanese fleets in Japan's home waters? Could Ming Chinese forces done any counter-invasion raids or assaults against Japan? What would have been the effects of either trying? Could the Japanese have widened the theater of war to other parts of the Chinese coast, with any effect?
What if, as in those wars, both sides took more elaborate counter-moves. For instance, could the Koreans have had any success using superior naval gunnery and mobility to transport a superior force to seize and hold Tsushima island from the Japanese, or to devastate any of the Japanese ports of debarkation or Japanese fleets in Japan's home waters? Could Ming Chinese forces done any counter-invasion raids or assaults against Japan? What would have been the effects of either trying? Could the Japanese have widened the theater of war to other parts of the Chinese coast, with any effect?