The Imjin War broke out in April 1592. The Japanese army had invaded the whole of Chosun except Jeolla. The Ming Dynasty sent troops and they won a victory at Pyeongyang Castle battel in January 1953, which reversed the situation. The Ming troops chased the Japanese army, but they were defeated at Byeokjaegwan, which triggered the peace negotiation. The Ming Dynasty thought they did not need to fight battles, suffering losses. Japan also thought they could not only conquer the Ming but also station in Chosun because of their defeat at Haengjusanseong, bitter cold and a shortage of provisions. So, they started peace negotiation. Toyotomi Hideyoshi proposed conditions such as making the Chinese Royal princess the second wife of the Japanese emperor and ceding 4 Dos of Chosun to Jan pan, etc., which made the peace negotiation come to a standstill. Toyotomi Hideyoshi continued military operation to achieve his purpose. For example, he ordered his army to replenish provisions and move north and attach Jinju Castle to occupy Jeollado(the second Jinju Castle War in Jun 1953). Having recognized the fictitious properties in Ming-Japan peace negotiation, Chosun’s royal court tried to report this situation to the Ming directly, but failed because they needed to accuse the Ming’s troops(e.g. Song, Eung-Chang, etc.) for their mistakes. So Chosun had to seek measures to save themselves so they tried to negotiate with the Japanese army directly. However, on the other hand, they fight battles (i.e. two-pronged policy). Negotiations proceeded between Lee, Bin, Baek, Sa-Rim, Kim, Eung-Seo vs. Konishi Yukinaga, Nabesima Naoshige and Yanagawa Sigenobu in Hamyang and Yangsan, and between Reverend Samyeong vs. Kato Kiyomasa in Seosaengpo. From the perspective of performance, since Chosun was excluded from the Ming-Japan peace negotiation, Chosun came to know the existence of peace negotiation through this and Chosun also alienated Gato from Koshini. Meanwhile, Chosun attacked the Japanese army in the coastal areas(e.g. Woongcheon and Geoje). They defeated enemy ships in Woongcheon sea battel(FEb-Mar 1593) and Danghang sea battel(Mar 1594), but most of the enemies took flight inland. In Sep-Oct 1594, Do marshal Gwon-Yool commanded amphibious operations, in which the army generals such as Gwak, Jae-Woo and Kim, Deok-Ryeong joined. During the peace negotiation, both nations confronted with each other in the southern coast. But the Ming held Chosun back from attacking the Japanese army, but Chosun kept spying on them to have the opportunities to attack. Chosun was in a awkward position, more precisely Chosun was in a fix because both winning and losing battles would bring problems to them. This is the reason why Chosun parallelled both negotiation and battle.