Although North Korea is a tiny place, and has always existed as a subordinate country of China in ancient times, it seems to have no sense of existence. However, Li Fangyuan was not satisfied with the status quo after he became the ruler of the Lee Dynasty in Korea, which led to the Doumen tragedy and the reshuffle of the East Asian pattern.

At that time, in order to develop the Lee Dynasty, Li Fangyuan sent people to lobby the tribal leaders of the surrounding ethnic minorities, hoping that they could lead the troops to submit, including Timur, the sixth ancestor of Nurhachi. Timur, the fierce elder brother, saw that the Li Dynasty was inferior to his own tribe and rejected Li Fangyuan's suggestion. When Aha, who was the enemy of Timur Meng, led his troops to surrender to Daming, Timur Meng became weaker and weaker, but Li Fang foresaw that you were unwilling to cooperate, so he directly fought with you, so he sent troops to occupy Timur Meng's land.

Timur, the fierce elder brother, still has some difficulties in dealing with Li Fangyuan alone, so he also paid tribute to Daming. What he did was to stimulate Li Fangyuan. I told you to give in, but you refused, and Daming was in a hurry. So Li Fangyuan openly attacked the Jurchen tribe.

At that time, Timur, Meng Ge and others avoided the migration of the sharp edge of the Li Dynasty, but Li Fangyuan did not stop there. Instead, they sent troops into Liaodong, killed several Nuzhen tribal leaders, and robbed tribal materials and population, which was the famous "Doumen Massacre".

This completely angered the Jurchen ethnic group. Under the leadership of Timur Meng Ge, several Jurchen tribes joined forces to attack the Li Dynasty, which was losing ground and had to ask Daming for help. On the surface, Mungo Timur and others respected Daming's reconciliation, but they did not stop attacking, which also led to the suspension of Li's plan to expand to the northeast and made the pattern of East Asia more complicated.