On the day of Mijin's daughter Cho-hee's wedding, Cholla Province is attacked by the Japanese armed with muskets. Cho-hee is taken prisoner by Wakizaka Yasuharu to Japan. Invasion of 1587 was a test battle for the Japanese for the seven year war that was to come, but the Chosunese government misses its opportunity to prepare their defense by dismissing this invasion as just another foray. Nomads that keep their preying eyes on Nokdune Island learn that Soon-shin is trying to supplement his force and devise a scheme to interfere. Ultimately, the idea of burning the farms and abandoning the island is brought up in Chosan Fort.
—https://www.yidio.com/show/the-immortal-yi-soon-shin