 Lee Seong-gye passes all his military training with the highest honors and at a very young age. He puts down a rebellion and destroys the Yeojin tribe that was threatening the northern villages. The king gives him three armies to defend the northern border, but Seong-gye takes his soldiers and marches on the capital. He dethrones the king. Taking the name King Taejo, he becomes the founder of the Chosun Dynasty.