In the middle of 14th century, when the period Japanese pirates were rampant in the seas of East Asia, the domestic & foreign circumstances of three countries in East Asia (Korea, China, and Japan) were very complicated. Using such confused stage, Japanese of Kushu and Tsushima become Japanese pirates and attacked Korean peninsula and the coast of China. Therefore, the seas of East Asia entered into the period of pillage. The period of the most extreme pillage in Korean peninsula was about 100 years since the middle of 14th century. The scale of pillage were dozens of ships when small in numbers and 500 ships when large. Also, the pillages were made more than about 500 times. The pillaged areas were extended to costal area as well as even to deep area of inland. Foods and livestock were pillaged and people were kidnapped. Even after the foundation of Chosun dynasty, the pillage of Japanese pirates continued, and Chosun dynasty resolved their problems through the establishing of friendly relationship and appeasement such as the expansion of military preparation, the suppression of Japanese pirates, and diplomatic negotiation. Coexistence and symbiosis with Japanese pirates were completed through the open of ports, three ports system, and Gyehae agreement, and were searched by opening three ports in Gyeongsang-do. Japanese who entered into three ports made a trade, and kept a peaceful relationship by meeting the king of Chosun (those who entered into Hanseong, the capital of Chosun) and being incorporated to diplomatic order of Chosun. ``The period of pillage`` started by Japanese pirates in the middle of 14th century was shifted to ``the period of friendly relationship`` by the open of ports, and was entered into ``the era of coexistence & symbiosis`` through Gyehae agreement in 1443. Since then, ``100 years of three ports era`` ended with the war of Japanese pirates at three ports(三浦倭亂) means that three ports had existed as ``spaces of coexistence & symbiosis``. of Suk-Ju Shin was a writing which collected such procedure and a masterpiece arranging the policies toward Japan which oriented to coexistence & symbiosis with Japan. In such point, we have to focus again to of Suk-Ju Shin as a ``message of history for coexistence & symbiosis``.