In the history of ancient East Asia, a system of rule centered on China was basically established. Under the circumstances at that time, China was far ahead of the surrounding small countries in terms of economy and military, so China at that time was a real heavenly kingdom. The others are barbarians, all of which are our vassal states, such as Korea, Vietnam, Thailand, etc., which are all thousand-year-old vassal states of China and are very loyal to China. And only this country, the founding emperor of the Ming Dynasty, Zhu Yuanzhang, repeatedly reminded him to beware. And 500 years later, this country has indeed become a major problem for China, and it has launched successive wars of aggression against China for 50 years.

This is the Wokou, also known as Dongying in ancient times, that is, Japan, and after Zhu Yuanzhang established the Ming Dynasty, the surrounding countries quickly became vassal states. At that time, Japan was still in a period of division, mainly divided into two dynasties, the north and the south. After Zhu Yuanzhang ascended the throne, he sent emissaries to Ryukyu and Japan to submit to Daming and become vassal states, and Ryukyu and others immediately called themselves Chennagong.
However, at that time, Japan was very arrogant, and although the projectile country was still in the era of great division, it was even more vulnerable. However, they categorically rejected Zhu Yuanzhang's edict. For this reason, Zhu Yuanzhang was greatly angry, and several times he was angry and wanted to send troops to attack Wukou. However, at that time, the Wokou had such confidence, and it was only during the Yuan Dynasty that the three conquests of Japan failed. Not because of how powerful Japan was, at that time, the Yuan army basically encountered sea breezes and waves and the whole army was destroyed.
This edict was received by the Southern Dynasty of Japan at that time, but instead of yielding, it directly killed 3 emissaries, and killing the emissaries would be equivalent to declaring war! Therefore, Zhu Yuanzhang wanted to send a large army to attack Japan, but, given that daming had just been unified, and several attacks on Japan in history had failed because of naval battles. Therefore, on the one hand, Zhu Yuanzhang did not want to lose the people's wealth and add variables to the situation that had just been unified; on the other hand, he was also afraid that his army would be blown away by the wind like the Yuan army, and the face of the great power of the Heavenly Dynasty would be lost.
However, Zhu Yuanzhang has always guarded against Japan, although in order to work hard for the people and hurt the people and money, he has included it in the list of 15 countries that will never attack, but after Japan has added the sentence "Japan is treacherous, he will be a disaster in the future, and his descendants must always be on guard." Unexpectedly, this sentence was quickly fulfilled, and the Japanese Wokou continued to increase their plundering of the Daming coast, and in modern times, they launched the Sino-Japanese Sino-Japanese War, the September 18 Incident, the War of Aggression against China, and the plague on China for 50 years. It has become the greatest disaster in China.