General Lee Jung-ki, who defended Goguryeo's last pride.

 Lee Jeong-gi was born in 732 A.D. as the son of Goguryeo refugees. Lee Jung-ki has watched his defeated compatriots of Goguryeo suffer various insults from the Tang Dynasty since childhood. So naturally, he developed a grand intention to recreate the glory of the old Goguryeo. In recognition of his natural talent as an armed man, Lee Jeong-ki worked as a secret agent under the Pyeongro Theft. In 755, Annoksan Mountain started a rebellion and took control of the Habuk area. Therefore, the Pyeongro Theft Department in Yodong and the Tang government in Jangan were divided into two sides. Lee Jung-ki didn't miss this opportunity. At that time, many of Liaodong's troops were filled with Goguryeo refugees. Lee Jeong-gi gathered them and took advantage of the death of Wang Hyeon-ji, a thief, in 758 to take over the Pyeongro Theft Department and take over the government. In the east, Balhae established a country by inheriting Goguryeo's national tradition, so Lee Jeong-gi did not establish a country in Liaodong. Instead, he tried to conquer the Tang Dynasty, the enemy of the people, and establish another Goguryeo in mainland China. In 761, he finally landed in Shandong Province, China, with 20,000 troops from Goguryeo. At that time, many Goguryeo refugees who were taken to the Tang Dynasty at the time of Goguryeo's defeat lived like slaves near Shandongseong Fortress. At the news that Goguryeo's large army, which had been thought to have been ruined forever, came, the refugees in Shandong danced with joy. In fact, 20,000 soldiers were very small. The Tang Dynasty had tens of thousands of troops in just one state, so 20,000 troops were not a big deal. Nevertheless, it was like hitting a rock with an egg that entered the middle of China with 20,000 soldiers. However, there were numerous Goguryeo refugees there. Also, the spirit of Goguryeo was alive. The Goguryeo army of Lee Jeong-gi defeated about 10 million Tang troops and quickly took control of 10 states. By 777 A.D., five more states, including Joju and Seoju, were secured and ruled a large territory of a total of 15 states. At this time, the population he controlled reached 1.3 million households and 8 million households, including Pyeongro. In this year, Lee Jeong-gi moved Chiso from Cheongju to Unju to attack Jangan, the party's capital. In 781, Lee Jeong-gi occupied Yonggyo Bridge and Wagu, blocking the removal of the Grand canal, a transport route for the Tang Dynasty. The Grand canal was the main artery of the Tang Dynasty that moved abundant supplies from Gangnam to Nakyang and Jangan. However, the Tang government in Jangan was greatly embarrassed when Lee Jeong-gi occupied this grand canal. At the same time, a total of 200,000 troops began to advance toward Jiangan, the capital of the Tang Dynasty. But can't Heaven help it? At the moment when he was on a roll and tried to defeat 200,000 troops in Byeonju to isolate them to the castle and advance to Nakyang, a large star fell across the night sky. This is the end of Lee Jeong-gi's life. Leaving Nakyang and Jangan, the last strongholds of the Tang Dynasty, in front of them, Lee Jeong-gi, who devoted his life to Goguryeo, died suddenly at the age of 49. Swallowing grief, the Goguryeo army retreated. When the news became known in Jangan, civil and military officials under Deokjong of the Tang Dynasty were delighted and held a feast for three days. In a word, a really cool person.