For the Goguryeo people who have been living in the bitter cold of the Liaodong Peninsula, the most important thing they lack is patience, and what they are best at is to hibernate, wait for their prey to show their flaws, and then kill them with one blow. From the very beginning, taking advantage of the last years of the Han Dynasty, when the princes of the world raised troops to attack each other, the Goguryeo people began to expand their power for the first time. By the time Cao Wei conquered the capital of Maru, the Goguryeo people were greatly weakened, and they finally took advantage of the invasion of Liaodong to crush Silla, and the national strength and heritage accumulated by Baekje were almost exhausted in this battle.

After conquering the capital of the Goguryeo people, Cao Wei believed that the Goguryeo people had perished, so he did not incorporate the barren land of Goguryeo into his jurisdiction, and began to withdraw the defenders in Goguryeo one after another and return to the original border line to garrison. After the withdrawal of Cao Wei's army, the Goguryeo people soon rebuilt a new one on top of the ruins of the old Marudu Fortress. And once again, it hibernated. It was not until the last years of the Jin Dynasty that the Central Plains fell into war again, and Goguryeo once again showed some fangs and showed its ambitions. In the autumn and September of the second year of Jianxing, he invaded Obibang County to the south and took the control of the northern part of the Korean Peninsula. In addition to conquering Baekje in the south, Khitan and Buyeo in the north, around the thirteenth year of King Gwanggaetu, all of them occupied Xuansu and Lelang, so that a large area of land east of Liaoshui was included in the territory of Goguryeo, and the territory of Goguryeo was unprecedentedly expanded.

However, Goguryeo's expansion was not without its challenges, and in the eighth year of Xiankang, the second year of the Eastern Jin Dynasty Emperor Sima Yan, the Emperor of the Eastern Jin Dynasty, the city of Marudu was attacked by the Former Yan. In the first year of Xian'an, which is the name of the Eastern Jin Dynasty Emperor Jin Jianwen Emperor Sima Yu, King Baekje Jinshogu led his army to attack Pyongyang City of Goguryeo, and the former king of Goguryeo sent troops to fight, but was accidentally shot by a stray arrow, and died on the 23rd of the same month. After the King of Goguryeo Little Beast Lin succeeded to the throne, he began to strengthen the stability and unity of Goguryeo, new laws were introduced one after another, and in the second year of Xian'an, Buddhism introduced from the Central Plains was established as the state religion, and in accordance with the Central Plains system, the national educational institution "Taixue" was established, in addition to the King of the Little Beast Forest also reformed the Goguryeo army, so that its combat effectiveness has also been unprecedentedly improved. In the third year of Yuanxing, it was the second year of the Eastern Jin Dynasty Emperor Sima Dezong, the 19th Dynasty of Goguryeo continued to attack the city, and the good prince Gao Tande often sent troops to plunder the Liaodong generation, which was not a shallow disaster.

But the good days didn't last long, and in a blink of an eye, the time period when Yang Guang ascended the throne as emperor came to an end, and the spring of the Goguryeo people was over. Not to mention that after Goguryeo reached its peak in the sixth century, it was inevitable that it began to decline gradually, and after the assassination of King Anzao of Goguryeo, his brother King Anwon succeeded to the throne, and during the reign of King Anwon, the disputes between the royal families gradually intensified. The two political groups fought over the succession to the throne, and finally the eight-year-old King Yangwon ascended the throne. However, the struggle for power did not end there, but intensified, and the opposition staff began to build up their own armies and exercise de facto control over their own territory.

In the first year of Daebao, the first year of Emperor Xiao Gang of Liang Jianwen, during this period, Baekje and Silla began a joint attack on Goguryeo in order to get rid of their enslaved status by Goguryeo, and Goguryeo lost the fertile Han River valley, which was strategically important in the middle of the Korean Peninsula. Baekje, the leader of the Baekje Silla Alliance, was extremely depleted in the war against Goguryeo, and the army was almost exhausted. Therefore, in the second year of Seungseong, that is, the year of Emperor Xiao Yi of Liang Yuan of the Liang regime of the Southern Dynasty, Silla sent troops in the name of helping Baekje, but launched an offensive against Baekje, and finally included the entire Han River valley. The whole nation of Baekje was outraged by Silla's betrayal, and the Baekje Sacred King attacked western Silla the following year to retaliate, but was captured by Silla and then executed.

In the seventeenth year of the reign of Emperor Wen of Sui, the king of Pingyang united with the Yan Ya to preemptively attack the military garrison in western Liao, but was repelled by Wei Zhen, the governor of Yingzhou. In the eighteenth year of the emperor's reign, Emperor Wen of Sui Emperor Yang Jian ordered Yang Liang, King of Shangzhu, Shiji, to be the marshal of the marching army, and Zhou Luoyu to be the head of the water army, leading an army of 300,000 to attack Goguryeo by land and water. When Yang Liang, the king of Han, led the Sui army by land to Linyuguan, which is today's Shanhaiguan, it was the rainy season, the roads were very muddy, and the supply of grain and grass was not enough, so that the army lacked food, and encountered epidemics, and the chances of victory were slim. Attacking by water, the Sui army, led by Zhou Luoyu, went out to sea from Donglai, which is today's Ye County, Shandong, and headed straight for Pyongyang City to leave the port, but unfortunately encountered strong winds at sea, most of the ships sank, and countless casualties were killed. So on September 21 of the same year, the land and water routes were forced to return. At this point, most of the troops of the Sui Dynasty died on the way to the battlefield, and they were killed or wounded without even encountering the enemy. After the retreat of the Sui army, Gao Yuan, the king of Yingyang, felt that the Sui army's military was too large, so he called himself "Liaodong Dung Tuchen Yuan", and Emperor Wen of Sui withdrew his troops and treated him as before.

However, Emperor Wen of Sui, Yang Jian's good speech, was only based on the premise that the country was worried about internal and external troubles and the situation was unstable, so he decided to stop the continued conquest of Goguryeo and resumed his previous attitude towards the Goguryeo people. But Yang Guang is different from his father Yang Jian, he doesn't have a good temper like Yang Jian. When he ascended the throne and succeeded to the throne in the prime of life, all he wanted was to make a feats that far surpassed the Qin Emperor and Han Wu, comparable to the Three Emperors and Five Emperors. At the same time, due to the needs of some political factors, Yang Guang aimed his foreign expansion at Goguryeo, and so far there was the matter of Yang Guang's three expeditions to Goguryeo, Li Wenyuan and Xue Ju mentioned in the previous document.

However, due to Li Wenyuan's accident, the Eastern Turks did not reach the extreme level of "Rong Di is blazing strong, and the ancient times are unprecedented" recorded in the history books, and the Turkic Khan did not include part of the Central Plains of the Sui Dynasty into his sphere of influence, and the Turkic Khan's plan to follow the example of Emperor Tuoba Daowu to obtain the Central Plains also failed, but fell into civil strife himself. He wasted a great opportunity, but he didn't have the extra energy to march south and get involved in the fat of the Central Plains. The Turkic civil strife naturally made it impossible to take care of the surrounding forces that depended on them.

The Goguryeo people took advantage of this once-in-a-lifetime opportunity to expand their sphere of influence westward. After incorporating the Xi tribe, a vassal state of the Eastern Turks, into his territory. Only then did it officially border with Li Wenyuan, who peacefully annexed Liu Wuzhou.