Why was the Sui and Tang Dynasties so obsessed with Koguryo?

Koguryo is a country that everyone is familiar with. It is the predecessor of Korea. Although they are arrogant now, they were honest in ancient times, and the Sui and Tang Dynasties tried their best to make them obey.

Let's talk about the Sui Dynasty first. Emperor Yang Di spared no effort to crack down on Koguryo. You said Goguryeo offended the Sui Dynasty? It doesn't seem to be, but its practice really makes "China" sleepless. Koguryo forces have been developing southward, occupying the most fertile place in northeast China. If left unchecked, it will definitely threaten the security of the Sui Dynasty. Therefore, Yang Di, a military monarch, conquered with millions of troops to teach him a lesson.

In 6 12 A.D., the army of Sui Dynasty went to Koguryo in a mighty way, which also frightened them. However, God played a big joke in this war, and Yang Di's million-strong army was defeated, which made him feel very embarrassed. Later, I went to Koguryo twice. Although he didn't fail, he didn't make any money. On the contrary, it made the domestic people miserable and finally triggered a large-scale uprising. Some analysts said that the first time I hit the Koguryo Emperor Yang Di was to show my prestige, and the last two were to save face.

What the Sui Dynasty didn't finish, Emperor Taizong and Li Shimin finished it for him. As an equally brave monarch, Li Shimin's army seems to be much larger than a loose bull. By World War I, it had wiped out tens of thousands of enemies, recovered Liaodong generation and moved into hundreds of thousands of people. Although Koguryo has not been eliminated, its purpose has been achieved.

For this matter, a Korean film called "Morning of the Empire" took a big turn. In the play, Li Shimin's army was not only defeated, but also shot blind in one eye by General Koguryo. Goguryeo's army invaded Chang 'an, and Emperor Taizong knelt down and begged for mercy, which was ridiculous. However, they neglected that the Emperor Koguryo in the play was born hundreds of years later than Emperor Taizong, so it was a joke for them to fight.