During the collapse of the Yuan dynasty, a faction of the Goryeo court supported a war against the Ming to seize the Liaodong peninsula, sending general Yi Seong-gye to lead the invasion. He would proceed to turn his army around and oust the ruling dynasty from power, forming Joseon. What if, instead of defecting and leading a revolt against Goryeo, Yi Seong-gye follows through on his mission and invades the Liaodong peninsula in order to "restore" ancestral Korean lands? Would he have been successful, and what kind of geopolitical consequences would such an invasion have, whether or not it succeeds?