The national flag was born in the "Geographical Discovery" period, when countries around the world broke through the state of independence and gradually moved towards integration, and the national flag represented the face and symbol of sovereignty of a country.
China's real national flag comes from the last years of the Qing Dynasty, when the Qing Dynasty's national strength was weak, and in the face of the invasion of Western powers, it had to open the door of the country and cut the land to pay compensation. But at the same time, with the deepening of exchanges with countries around the world, the Qing Dynasty also came into contact with the advanced culture of the West, bringing some positive changes to the country. Among them, when Li Hongzhang, a major diplomatic minister, attended various diplomatic occasions, he found that other countries had their own national flags, while the Qing government, as a big country, had only a bare flagpole, which made him very unhappy, so he proposed to the Qing government to design a national flag representing the Qing Dynasty.

Li Hongzhang's suggestion was supported by the Qing government, and the designers at that time used the special yellow of the imperial family as the flag background color, and then embroidered the scene of the flying dragon play beads, representing the honor of imperial power, quite characteristic of the Qing Dynasty. The official national flag was named the Yellow Dragon Flag.
Although it was in the late Qing Dynasty, but at that time Korea was still a vassal state of the Qing Dynasty, seeing that the Qing government had its own national flag, flying on the ships of the Beiyang Marine Division all day, which made the Korean sailors very envious, it felt that as a vassal state, it was okay to use the same national flag, so it made this request to the Qing government.
Unexpectedly, the Qing government categorically refused its request. This, which seems quite proud today, was a different story in the eyes of the Qing government at that time. In the eyes of the officials of the Qing Dynasty, if I share the flag with a small country, it would be very disgraceful for me to share the flag with a large world power.
However, North Korea was its own vassal state after all, and the idea of having a national flag was very reasonable, so Ma Jianzhong, the ambassador to North Korea at the time, thought of a compromise solution, that is, to redesign a national flag for them. Ma Jianzhong personally copied the knife, adopted Chinese Taoist culture, and designed a Bagua flag, which not only avoided duplication with the Yellow Dragon Flag, but also reflected the characteristics of the suzerainty of China, and in order to further reflect this relationship, the Korean flag also wrote eight Chinese characters of "The Flag of Goryeo of the Great Qing Dynasty".
In this way, the korean flag was successfully born, until after the outbreak of the Sino-Japanese War, the Qing government was defeated, signed the humiliating "Maguan Treaty", ceded Taiwan and the Penghu Islands, and Korea became a Japanese colony. Although the flag of North Korea exists, the words "The Flag of Goryeo under the Great Qing Dynasty" on it are intolerable to the Japanese, and under the interference of the Japanese government and the voluntary submission of the Korean government, the eight Chinese characters are finally erased. Later, after years of development and evolution, it finally became what it is today.
Well, that's the story of The Chinese, North korean, and South Korean flags. In fact, the solemnity and authority of the national flag is not only in the form and pattern of the design, but more importantly, in the comprehensive national strength of the country, as long as the country is strong, its national flag is extremely solemn and sacred in the eyes of others.