Before the Manchu Invasion of Korea, there was a time when Japan offered to send salvation soldiers.

 Perhaps it was before the Manchu war, but the Japanese diplomatic line, which was grasping the harsh Jo-Cheong relationship, once proposed the dispatch of rescuers. It is natural that the frightened mediation refused it without hesitation. Of course, even if this proposal was accepted, we should examine whether Japan really had a willingness to dispatch, but if it had such an intention, it would have created a rare scene to see. (It is Hidetoshi Miyake, a researcher at the Korea-Japan relationship, who has dealt with this issue in earnest.   He believes that the opposition of the shogunate to Mancheong and Tsushima's willingness to play up to Joseon resulted in an ambiguous proposal for this responsibility.) The first Sino-Japanese War broke out while the two orangkas tried to take their interests in other countries. Comparing the case of the Qing Dynasty and Japan in the early 17th century, the Manchurians at that time fell short of Japan's military capabilities. Nevertheless, Japan failed in 1592 and the Manchurians succeeded in 1636. The two lucky things the Qing Dynasty enjoyed at the time of the Manchu Invasion of Korea were that unlike King Seonjo, who only ran away without looking back to Uiju, it succeeded in capturing the hesitating King Injo in Namhansanseong Fortress, and that there were no strong external variables like the Ming rescue forces in the past. After King Injo surrendered to the Qing Dynasty, Ming sent an emperor's letter saying, "I'm sorry I couldn't help you," but in Japan, Joseon's weak force became a laughingstock at the Tokugawa family's meeting. Of course, they used misfortunes from other countries as a side dish, but they would not have felt good if they had known that Cheong Tae-jong had asked Joseon to join Japan in Daecheong on his way to withdraw from Joseon. Joseon did not convey this difficult request to Japan. It is embarrassing that I gave in to the force of Manchuria Orancae, and it is also because the demand for joining itself caused Japan's anger and there was a risk that the spark would spread to Joseon. It's been a long time since I read it, so I can't remember clearly, but just before the outbreak of the Manchu Invasion of Korea in 1636, a Joseon news agency was dispatched to Japan. I'm coming back. The diplomatic achievements were great, such as being treated intensely by Tokugawa Imitsu, but when I came back, the Jongno area was in ruins, so the news agency wails, shouting, "What's the use of being good at diplomacy?" The record is included in the <Haenghaengchongjae>, which collects the knowledge of Joseon Tongsinsa, and it is read. I remember being touched by the author's sadness.